![]() Miscarriages rates declined between 6 to 10 weeks, according to a study of 697 pregnancies with a confirmed fetal heartbeat:Ī similar study of 668 pregnancies with a confirmed fetal heartbeat between 6 and 10 weeks, found a similar decline in miscarriage risk by week:īut for women in their mid to late 30s and early 40s, these studies understate the risk. E ven after confirmation of a fetal heartbeat, miscarriage risk remains high for women 40 and older through 12 weeks, according to a study of 384 women 35 and older. Fortunately, for most women by 14 weeks their chance of a miscarriage is less than 1%. The risk is highest early in the first trimester. Miscarriage risk drops as pregnancy progresses. Where possible, I break down the risk by…Įdit: I also have a new post on how morning sickness signals a lower risk. So I have compiled a summary of the best research on risk of miscarriage. The lack of good information frustrated me when I was pregnant, and I bet it frustrates you too. Problem 3: Nearly all these sites derive their statistics from just two small studies, one which tracked 222 women from conception through just the first 6 weeks of pregnancy, and another which tracked 697 pregnancies, but only after a fetal heartbeat had been detected–a key point, because heartbeat detection dramatically lowers the chances of a miscarriage. Problem 2: These sites do not breakdown miscarriage risk by other known risk factors, like the mother’s age. ![]() Problem 1: These sites rarely provide their sources, so you cannot tell whether their information is reliable. Many websites claim to tell you your risk of miscarriage, citing statistics that look like these : Commonly reported chances of miscarriage by pregnancy week ![]() Trying to figure out your chances of miscarrying? Sadly, you are going to have a hard time finding good information.
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