Freaking out

Okay so almost three weeks ago my boyfriend and I had sex but we used a condom and he did not even cum in the condom, he took it off and came on my back. This was three days before my fertile window and I am freaking out now. My breasts are hurting really bad and my stomach hurts a lot. The only thing I can think of is maybe the condom slipped and there was precum or something?? Please give me some peace of mind. What are the chances that I’m pregnant? My period is due in five days. I’m so scared. I can’t have a baby.