they just swab you to check & doctor started checking at 37 weeks but if you ask they will check at least mine does
I think my doctor did my GBS test at 34/35 weeks.. can't remember exactly. Lol. I tested positive for it.
Same on both here @ehendricks
Probably for strep b if you haven't already had that done. My doctors started to checked me when I got the strep b test done which was 36 weeks for me. But some doctors maybe different.