birth control implant

Alex
I've had my implant for 2 months now and I waited 11 days to have unprotected sex (he never cums in me and we both got tested for diseases beforehand). I've had my period for 2 months now (waiting until the 3rd month passes and my periods are hopefully gone forever) and I'm currently on it but I'm still paranoid that I'm pregnant. I know it's impossible to have a period while pregnant unless something very bad is going on, and my logic says I'm not pregnant but my anxiety says "what if?" I have pain in my lower right side of my abdomen and I've been passing a lot of gas, that makes me nervous bc idk why but I'm also going to stop eating dairy just in case I'm lactose intolerant like my mother. Should I be worried about pregnancy?