Ok so a couple weeks ago I went for my yearly gyn exam and the doctor went to check my strings and…

Ok so a couple weeks ago I went for my yearly gyn exam and the doctor went to check my strings and she couldn't find it right away after a few long mins she found them and I'm asking her do she think it moved she said she wasn't sure so about to night ago after sex with my boyfriend like 2 mins later I started having unbearable cramps I felt like I was in labor mind you I had been having some side effects and I called my doctor and she suggest i take a test and I came out negative but I'm lost cause this has never happened before any mommy home thru this or is going thru now I'm so confused