Recently there have been videos making the rounds with a screenshot of table 4 (below) from the NEJM article Preliminary Findings of mRNA Covid-19 Vaccine Safety in Pregnant Persons. The data from that table suggests that there is a 76% to 100% miscarriage rate. 827 participants total, 700 had vaccination in third trimester, so 127 women who could have been getting the shot in the first or second trimester. 96 miscarriages in the first trimester. You do the math.