Read the thread here, it gets discussed.
The study says "Among 3958 participants enrolled in the v-safe pregnancy registry, 827 had a completed pregnancy, of which 115 (13.9%) resulted in a pregnancy loss and 712 (86.1%) resulted in a live birth (mostly among participants with vaccination in the third trimester)."
What happened to the 79% that did not complete their pregnancy? That's what I want to know.