Not really tho? out of the 30% of pregnancies that miscarry, 19% fail after the 5th week, 9% after the 7th week, 2.5% after the 10th week and only 1.3% after the 13th week. So assuming those in the periconception stage just flew under the radar, a 96/8 ratio is kinda what you'd expect. Rounded to the accepted average of 19/1.3 we are looking at a 8.3% ratio versus a 5.8% ratio. This might actually be caused by the shock of the vaccine (it would've been helpful had they included more cross statistics about whether the miscarriages also had full-body adverse events), but it might simply be due to a relatively small population (it is after al not much outside of the expected variance you would expect with such a small sample), or a skewed window of observation that probably missed an few cases.