Sharp pain

FTM at 30 weeks pregnant. The entire pregnancy my baby has been really low (or to one side) which i have found is normal for some pregnancies. Today i have experienced some quite large movements from him (possibly him rolling around) They are on the lowest area of my bump so not as low down as what i usually feel but everytime he does it i feel a sharp shooting pain in my vagina (lasting a couple of seconds). Anyone else experienced this?