Resons for a delayed pregnancy Hope this helps
Stress
Stress can affect many things in our lives, including our periods. Sometimes we're so stressed out that our body produces hormones that halt our bleeding. Working with your doctor or midwife can help you figure out what you need to do to relax and get back on schedule.
Illness
A sudden, short illness or even a longer illness can cause your periods to be delayed. This is usually temporary.
Change in Schedules
Changing schedules can really throw off your body clock. This is particularly true if you go from days to nights at work or vice versa.
Change in Medications
Perhaps you're trying a new medication and a delayed or absent period is the cause. Be sure to talk to your doctor or midwife about this side effect. It is very common with some methods of birth control.
Being Overweight
Carrying around too much weight can hormonally shift your cycles and even stop them. Most women will see a return to normal cycles and fertility with the loss of some weight.
Being Underweight
If you do not have enough body fat you will not have regular periods, sometimes you can eve cause your periods to stop all together. This is called amenorrhea. Typically a weight gain will help you have your periods return. This is a frequent cause of a missed period in women who work out to an extreme or are professional athletes.
Miscalculation[
The menstrual cycle varies from woman to woman. While we say that the average menstrual cycle is 28 days long, that is not true for everyone. Sometimes our period is believed to be late when in all actuality we have simply miss calculated. If you have irregular menstrual cycles, but know when you ovulate, look for your period about two weeks after you ovulate. That may help you keep an easier track of your periods.
Peri-Menopause
Peri-menopause is the period of time where you are transitioning from reproductive age to a non-reproductive age. Your periods may be lighter, heavier, more frequent or less frequent - but mostly just not normal. If you do not wish to get pregnant, be sure to continue to use birth control because you are likely to still be fertile at least some of the time.
Menopause
Menopause is when you have reached the point in your life where you will no longer ovulate or menstruate. Menopause can be a natural life event or may happen surgically through hysterectomy or through chemical such as chemotherapies.
Pregnancy
Finally! Yes, your missed period might be because you're pregnant! A simple pregnancy test can usually help you determine if you have missed your period because you are pregnant. The urine pregnancy tests and blood pregnancy tests look for the hormone hCG.