Sex stresses me out too much, but I do enjoy it.

I recently starting having sex with my BF(was a virgin) but everytime (and knowing how I am, I knew this would happen) I get super stressed and anxious waiting for my next period to come everytime we have sex, because the thought of getting pregnant freaks me out. I don't want kids, and even if I did, not anytime soon. I came back home and maybe a week before leaving his apartment we had vaginal sex ( condom + pulled out with the condom on), and not during my super high risk days. It's like I have a phobia of being pregnant or having a child. I have severe anxiety and depression and I'm just starting to think sex isn't worth this stress, which makes me sad. I don't feel any different than I normally do before my period, but the problem is my anxiety makes me feel and think I have something when it's not true. Like right now, I can say I feel like I'm having cramping, and pains , and it feels like I am, but my mind is so powerful to make me feel things that aren't happening. My period is in 3ish days and I'm racked with anxiety and stress, constantly googling "early pregnancy signs" and I don't have any of them but I'm still so stressed.