Pregnancy Scare

Okay I currently have a scare. So that day I had been feeling weird where my ovaries are like kind of as if ovulating but my period had just ended a few days earlier so I don’t know what that was about. So basically my boyfriend and I were making out and then he had a boner and I think he was adjusting himself with his hand then he put his fingers down on me like rubbing and then after I was essentially jacking him off but he didn’t finish but what I guess I’m worried about is it like while adjusting or something before he went to me like could anything have happened? I know it sounds dumb but I just need some peace of mind yeah. After I did it to him I went to the bathroom and was careful to hold the ends of the underwear as to not get anything from my hands on it and then I washed my hands but I’m still a biiit worried if something happened there. Again I know it might sound dumb and he didn’t cum but I’m wondering if precum? I’m not even sure if he had that though but yeah. Thank you ahead of time. I’m also asking because I developed back pain today lower and upper back but I was working out yesterday so I’m thinking that might be it? Also I’m 18.