they do! but it's so worth it knowing that that one shot will keep your body from killing your precious baby.
with my daughter I got 3. one after her twin sister died at 7 weeks, 1 at 20 weeks, and then one after she was born.
this pregnancy I'll get one at 20 or 25 weeks and one after I give birth.
I got mine at 20 weeks and another one after my little man is born hopefully in a few days