Weird feeling

Ok so i am 30 weeks pregnant and 4 days ive been having like this weird sharp pain in my vaginal area this is my 4th. Kid but never have i felt this feeling before it hurts to walk sometimes even laying down it hurts and feels like i got punch in the vagina really hard... I dont want to go get checked out if its normal i just dont remember ever feeling it with my other 3 my oldest was born at 36 weeks my middle was 37 weeks 4 day and my youngest came 3 days before her due date i go see my obgyn on the 18th and i plan on talking to him and have him check me then but just wondering does anyone else feel these pains and what do udo for them?