Pinching in ovaries? Please help !!!

I am experiencing some pinching around my ovary/ uterus, I am on nexplanon and I am more than positive that I am not pregnant because I was on the pill for 19 days before getting my nexplanon , I'm also experiencing some light brown discharge , I don't know what could be wrong with me but are these normal side effects? 😭😭 I'm scared I could be pregnant but I haven't had sex since I got my nexplanon 10 days ago!!! It's mostly impossible 😔