Sharp occasional pain

I had a miscarriage in May and just tested positive 3 days before my period. I don’t want to get too excited but was wondering if any mamas out there ever experienced occasional one sided pain. I know it’s early and my GYN will see me tomorrow to do an ultrasound and rule out possible ectopic pregnancy if that’s he case. I don’t have any other issues but I am very nervous this could turn into the inevitable. If any of you can share your experience I’d appreciate it. I hope you don’t mind my post is anonymous.