As far as I know prometrium doesn't cause miscarriages, however, you can still miscarry while taking it if there are other causes involved (ex- chromosomal issues, immunity problems, etc...). It's really easy when you miscarry to look for things (or even people) that could have caused it when all it was is pure coincidence and bad timing.
Truth be told, 9 weeks is pretty late for a doctor prescribe it, too. Most of time, it works best if you start taking right when you find out you're pregnant or even while you start trying to conceive. In fact, some doctors remove people from it at 9 weeks, but that is usually too early as the placenta really doesn't start producing adequate progesterone until week 12.
To the one person on here who blames the your miscarriage on this medication, I find it HIGHLY unlikely that it was caused BY the medication. Especially when miscarriage for the most part is such a mysterious thing and most of the time a doctor can not tell you exactly why you miscarried an early pregnancy. Miscarriages most often go unexplained.
To answer another question I saw on here, from the research that I have done yes light spotting is common when on this medication even during pregnancy and does not indicate miscarriage. If the flow gets heavier, turns bright red, you see clotting, and start getting pains then you need to call your doctor but otherwise light spotting that is brownish in color should not be cause for immediate alarm but you should at least call your doctors office and ask.
I am lucky enough to say that I was able to have a healthy baby boy, and a healthy baby girl all on my own with out doctors help, however, my husbands and my dream was for 3 children. Something in my body changed after having her and we have had 11 miscarriages in 3 years. After finally getting a doctor to take my miscarriages seriously, they sent me to an endocrinologist who found that my progesterone levels are very very low. She believes that's why we have had so many miscarriages. She prescribed me Prometrium 100mg, once daily for 14 days before each period and told me should I miss my period to continue to take the medication and come see her for a pregnancy test and that if I was pregnant they were going to up the dosage.
Yes, the prescription information that came with it says do not take if you're pregnant, and their website says the same thing. It also says to call your doctor to get further instructions. Which means a doctor isn't going to prescribe you something they know will purposely hurt you or an unborn child. They wouldn't want to face that kind of lawsuit or reputation.
I look at it this way, if taking this medication puts me that much closer to having my dream then I'm going for it. If it ends up not working out then I'm still in the same boat I have been in for 3 years and will try something else. When I look at it this way, I don't have much more to lose but I have a whole lot I could gain.
Does proterium works for you? I am 8 weeks pregnant and I started spotting 4 days ago, my doctor prescribed this pills and I started today, I am afraid that it may be too late