After ectopic pregnancy

Al

I had an ectopic pregnancy early January 10th. It was over early February when it was over. I wasn’t so far along. Probably 2 weeks barley. I didn’t get surgery for it. They just injected about 2 shots into my butt. But my man and I have still been having sex. He’s been ejaculating in me and I took 2 pregnancy test and both negative. How soon can someone get pregnant?