are you having any symptoms like sore breats, change in the areola color, more sleepy, mood swings, urinating alot, implantation bleeding. it could be your body does not have enough hcg in it for a hpt to show a positive. just relax that will make your period be late when your stressed. make an appointment with your doctor for a blood test. the test will tell them how much hcg (the pregnancy hormone is in your blood) they say anything over like a 5 is a pregnancy anything under that is not. a hpt needs like 20 thats the amount of hcg in your urine to get a positive.
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good luck Source(s) DID YOU KNOW... Pregnancy is counted from the first day of a woman's last period. This means that at conception, the unborn child is already considered two weeks old!
Six Weeks: By twenty-one days after fertilization, the embryo's tiny heart has begun beating.
More about the First Trimester
The First Trimester
(Week 1 - Week 12)
Your period stops or becomes very light.
You may feel nausea or queasiness. Some women vomit. ("Morning sickness" can happen any time of day -- it may help to eat small meals throughout the day, snack on crackers or toast, or drink juice or lemonade.)
Your breasts swell and may be tender.
Your nipples and the area around the nipples (areola) get darker and broader.
You have to urinate more often.
You feel tired.
You may become constipated and have heartburn (Tums may help).
You may have headaches.
You experience mood swings -- feel angry, sad, or happy for no reason.
Types of Pregnancy Tests
There are two main types of pregnancy tests. Both are commonly used to detect pregnancy.
The Urine Test
The urine pregnancy test is one of the most popular ways to detect pregnancy. It works by detecting levels of hCG in the urine. Home pregnancy tests are actually urine tests that can be performed in the privacy of your own home. There are a wide variety of urine pregnancy tests available on the market today. Each test ranges in sensitivity, with some urine tests being able to detect hCG levels as low as 15 ml/u.
Performing a Home Pregnancy Urine Test
A home pregnancy test is pretty easy to perform, though each test varies in procedure. Be sure to read the instructions included with the test before you use it. Also check to make sure that the expiration date hasn�t passed. Most urine tests come with a testing strip which, when exposed to urine, detects the presence of hCG.
Remove the test strip from the package.
Insert the test strip in your urine stream or dip the strip into a cup of urine (follow the instructions on the box).
Wait for the indicated time (usually a minute or two).
The test strip should have changed colors or be displaying a symbol that alerts you to whether you are pregnant or not.
The Blood Test
Pregnancy blood tests are performed at your doctor�s office or health clinic. They detect pregnancy by measuring hCG levels in your blood. There are actually two types of pregnancy blood tests:
Quantitative Blood Test: The quantitative blood test detects pregnancy by measuring the exact amount of hCG in your bloodstream. It can also be used to detect how far along you are in your pregnancy.
Qualitative Blood Test: The qualitative blood test detects pregnancy by indicating the presence of hCG in your blood. It does not measure your hCG levels, and only provides a yes or no answer as to whether or not you are pregnant.
Performing a Blood Test
Blood pregnancy tests are performed by health care professionals in an office or a clinic. It is just like a simple blood test:
A spot on your arm will be cleaned with alcohol.
A needle is inserted into your arm.
Blood is drawn from the needle into a little tube.
The tube is sent to a laboratory where it will be tested. Pregnancy test results typically take a day or two.
Pregnancy Test Accuracy
The accuracy of pregnancy tests has improved over the years. Both urine and blood pregnancy tests are surprisingly accurate � in fact, they claim to produce results that are 97% to 99% accurate. Of course, mistakes can happen and it accuracy often depends on how the test was performed.
Home Pregnancy Tests
Home pregnancy tests are usually about 97% accurate, but this varies from brand to brand. In order to get the most accurate results, it is a good idea to wait for about a week after your period is due before testing. This allows more hCG to build up in your urine, which will allow for a more accurate test. Some urine tests can be used on the first day that your period is due, however, it is unlikely that you will achieve that 97% accuracy rate if you test so early. It is best to perform a urine test in the morning, before you drink or eat. This will allow for a buildup of any hCG in your urine.
Clinic Tests
Blood tests performed at your clinic have a 99% accuracy rate and can detect pregnancy earlier than most urine tests. Blood tests can be performed 7 days after you ovulate (which is about a week before your period is due) and still provide accurate results. Sometimes, lab oversights can affect the accuracy of results, however this is rare.
False Results
It is possible to receive false results, both positive and negative, from your urine or blood pregnancy test.
If you get a false positive from a home pregnancy test, it is usually the result of faulty test strips. Most home pregnancy tests now have an indicator that shows whether or not the test is working correctly. If you leave your pregnancy test too long before checking it, this can also cause a false positive. Eventually, the urine will soak through the test, exposing the chemical strip that indicates pregnancy. Be sure to follow the instructions as closely as possible.
Both blood and urine tests can also produce false positives if you are taking a drug that contains hCG. These drugs are commonly used in fertility treatments, so ask your health care provider about whether your medications could affect pregnancy test results.
False negative pregnancy tests are also possible and typically occur with early pregnancy tests. If you test too early you may not have enough hCG in your urine or blood to indicate pregnancy. It is important to repeat your pregnancy test again a few days later, even if you test negative
Implantation Bleeding
After ovulation the egg travels into the uterus and burrows into the lining of the uterus. For some women implantation will cause slight bleeding or spotting. This is called implantation bleeding. This is sometimes confused for an early period.
What does implantation bleeding or spotting look like?
Implantation bleeding, also called implantation spotting, does not look like a regular menstrual period. Implantation bleeding is scanty and usually pink or brownish discharge.
Implantation bleeding or menstrual period?
Implantation bleeding normally occurs a week to a few days before your period would normally start. Spotting that occurs around a week after ovulation is likely implantation bleeding; whereas, spotting that occurs very close to the time that your period would normally start may not be. A normal menstrual cycle generally starts off light and then gets heavier. Spotting can sometimes be the sign of an early period. If this is the case, the spotting will pick up to heavier bleeding. If you have spotting right around the time your period would normally start, it can be more confusing. You will need to take the wait and see approach or take a pregnancy test to determine pregnancy.
What if I feel like my period is about to start?
If you have had spotting and think it might be implantation bleeding you may be paying very close attention to your body. If you are trying to get pregnant, the good news is that early pregnancy symptoms feel very similar to the start of your period. If you are pregnant you may begin to notice symptoms of early pregnancy right around the time your period would normally start and sometimes sooner than that. If you suspect pregnancy you can test for pregnancy as early as ten days after ovulation.
How common is implantation bleeding?
Implantation bleeding is fairly common with pregnancy. Twenty to thirty percent of women will have spotting during early pregnancy. If you have some light spotting before your period would normally start this is not something to worry about and may be a sign of pregnancy.
Am I pregnant? How early can I test?
If you and your partner are trying to conceive, one of the hardest parts is the waiting. The infamous two week wait is enough to frustrate even the most patient woman. The question thus arises, do you need to wait two weeks? With advances in technology it is now possible to detect pregnancy from the convenience of your own home before you have even missed your period. How early you can test depends on the type of test you are using.
How pregnancy tests work
Whether you are having a blood test done in a lab or using a urine test as home, the both work by detecting the hormone hCG. There are several types of tests done in the lab that can detect hCG. Many doctors use the same type of test as the kits used in home pregnancy tests. These tests work by using a substance that changes color once it is bound to hCG. Blood tests can be used to determine the exact amount of hCG being produced by the woman whereas urine tests are limited to determining whether or not hCG is present at a high enough level to confirm pregnancy. A pregnancy test is considered positive if the hCG level is 5 mIU/L or above.
What is hCG and when will I begin producing it?
To understand how pregnancy tests work it is helpful to know what hCG is and the basics of early fetal development. HCG, or human chorionic gonadotropin, is produced very early in pregnancy and serves several functions to support the developing baby including stimulating progesterone and estrogen production.
As pregnancy begins, your baby goes through many phases of development. A woman's egg and man's sperm unite on fertilization to form what is technically now called a zygote. The zygote goes through rapid division eventually forming an outer layer called a trophoblast. The trophoblast will begin secreting hCG during early pregnancy. This does not occur until your baby implants into the uterus. Ovulation and fertilization typically occur midway through a woman's menstrual cycle, usually around 14 days after the start of menses. If fertilization occurs, the zygote will travel down the fallopian tube towards the uterine cavity. Around seven to nine days after fertilization, your baby will implant deep into the uterine wall. Your body will not begin producing hCG until then. Once your body has begun producing hCG you should be able to determine pregnancy through a home pregnancy test.
When should I test?
Newer home pregnancy tests detect very small amounts of hCG, some as low as 5 mIU/L. With these very sensitive tests, it is possible to test positive as early as seven days past ovulation. It is important to remember that implantation occurs anywhere from seven to ten days past ovulation and women produce varying amounts of hCG, eventually forming a pattern of doubling hCG amounts every two to three days. While it is possible to test positive as early as seven days past ovulation, there is also a good chance that implantation has not occurred yet or that you are not producing hCG at a high enough level to be detected by a home pregnancy test. For best results, it is still recommended to wait until a woman has missed her period or 14 days past ovulation. For those that just can't wait, the very earliest you should test is seven days past ovulation.
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