Advice Please!!!!

OK so I have been having a lot of unprotected sex for the last two months I also haven't been taking my birth control. I've been having sex on my fertile days before my fertile days and after my Fertile days!!! I still am not pregnant even though it's small I have symptoms like nausea not feeling good don't want to eat. And my period comes on early every month, weird for me every pregnancy test I take is negative lately I've been having a lot of pain down towards my uterus on the right side mainly. could something be wrong or could I be pregnant in my tubes???? somebody help what's going on???!!!!!