Many women decide not to tell others that they are pregnant until they have safely passed the first trimester. It is probably true, that if you can progress through the first twelve weeks, your pregnancy has a much greater chance of successfully carrying to the point of a live birth. The overall miscarriage rate is 17-22% (including early pregnancy losses), so miscarriage is quite common.
For women with no danger symptoms, and a confirmed heartbeat on ultrasound, the risk of miscarriage is as follows:
"The risk fell rapidly with advancing gestation; 9.4% at 6 (completed)
weeks of gestation, 4.2% at 7 weeks, 1.5% at 8 weeks, 0.5% at 9 weeks
and 0.7% at 10 weeks" (from http://www.ncbi.nlm.nih.gov/pubmed/18310375)
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