Side stretching pains at 8w5d..

I need some advice because I'm worried. I have had 4 miscarriages. all of them had cramps but they were more severe and differnt. with this pregnancy I have heard the heartbeat twice and everything looks perfect with baby. For the last couple of days my lower sides of pelvis have been having pain. It will alternate sides everyday. like one day it will be left one day will be right. some times it feels like a very quick pinprick with a little bit of pain but not too much. Then sometimes sometimes sometimes it feels like a stretching sensation with pain. Not too painful but just noticeable and worrisome. I have never had a full term pregnancy so I do not know what to expect. If anyone has felt the same thing or has any advice please comment. it would really help me out.