Share these concerns with your health care provider. But to put your mind at ease until then, be aware that many people smoke and drink alcohol for the first five or six weeks of pregnancy with little or no effect on the baby. A lot has to do with how much, how often, how diluted, and your basic overall health.
Some studies have suggested that 30 mcg a day is the amount that should be available to women over 19 years of age who are pregnant.
Although 660 mcg may seem like a lot, think about your pain relievers. They go all the way from 81 mg to 500 mg and some people take two. So do you need 81 mg or 1000? Depends, doesn't it?
One of the studies quoted by the Linus Pauling Institute article below said that most people tolerated a daily intake of 400 mcg. There were incidences of kidney and liver problems in some people after five or six months at the levels you are taking. If you have combined your intake with a lot of significant excercise, then you will have excreted more of it; conversely, if you take it with Vitamin C, you may have retained more of it.
Until you get in to see an ob/gyn, rely on the old internet. Look up chromium and see if you can find anything on how much is considered bad. It won't change the last four weeks, but it might give you some peace of mind.