I have to post my additional thoughts as a counter argument to what I've posted before. The 82% may actually be incorrect, here's the argument why:

1st trimester = 0-12 week, 2nd trimester = 13-28 weeks, 3rd trimester = 29-40 weeks, birth = 37-42 weeks

(spontaneous abortion/miscarriage = before 20 weeks), (Born before week 28 = extremely premature, Born before week 37 = premature)

Spontaneous abortion can happen in the 1st trimester, or the first half of the 2nd trimester.

There were "1040 participants (91.9%) who received a vaccine in the first trimester and 1700 (99.2%) who received a vaccine in the second trimester"

Assuming roughly half of the women in the 2nd trimester were less than 20 weeks pregnant, then that leaves us with about 1,890 (1,040+(0.5*1,700)) women who could have potentially had a 'miscarriage' after the vaccine. So far, of these roughly 1,890 women, there had been 104 miscarriages (96 of which happened before 13 weeks, so 8 happened between weeks 13-20) and 23 live births (I'm guessing).

This is where it gets tricky: We don't know how many more women were still within 20 weeks but have not had a miscarriage at the time of the data. We don't how many women passed beyond the threshold of 20 weeks and therefore did not have a miscarriage, but still haven't had the baby. As time goes on, miscarriage rates drop significantly, so 104 may not be far from the ending total number of miscarriages from the 1,890 total eligible women.

When the data is finalized, we would need to see the number of live births vs the number of miscarriages among those 1,890 eligible women. (What's very important and should be included for the number of miscarriages, is 1. The age of the mother 2. What week was the miscarriage)

(For instance, miscarriages after week 10 it's roughly 3% chance, and 5th week it's 19% https://www.shortform.com/blog/chance-of-miscarriage-by-week-full-chart/). So the week number is extremely important to look at, so we can compare vaccinated miscarriage rates with non-vaccinated miscarriage rates by the week, and see if they are normal or have a large difference.

I think the reason this sample of 127 women is skewed disproportionately towards miscarriages rather than live births, is because live births can only happen after approximately 40 weeks. Most of the women who were not in their 3rd trimester hadn't had a 'completed pregnancy' by the time the data was recorded. Most of the women who were less than 20 weeks pregnant have not had the chance to birth the baby, so this is why there are so many less (23) live births than spontaneous abortions (104) at the time of the data. (Dec 14th-Feb 28th data is only about a 10 week period).