When I first got UTD (and probably until around week 16 or so) I would get sharp AF like twinges down low in my abdomen. My doctor said it was most likely my ligaments tendons and muscles stretching to make room for bubs. My doctor said it's very normal. But if you are concerend it's alwasy best to go see a doctor/midwife just to be on the safe side.

I know it's hard but try to not stress about it too much