Early pregnancy loss only refers to first-trimester spontaneous abortions. However, the majority of spontaneous abortions take place in the first trimester.
About 50% of miscarriages in the first trimester (up to 13 weeks of pregnancy) are brought on by chromosomal abnormalities. Your genes are carried by chromosomes, which are little structures found inside your body's cells.
Before the 12th week of pregnancy, the first trimester is when most miscarriages occur. 1 to 5 out of every 100 (or 1 to 5%) pregnancies) experience a miscarriage in the second trimester (between 13 and 19 weeks).
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