paranoid needing assurance

Ok this so I'm super paranoid about getting pregnant, the only sex I've had at all in the last however many months would hardly count it was with my ex and I was on birth control and on my period and he only stuck it in for not even a minute, he just wasn't very into it and then he got a cramp and lit his erection, even though I know that it's almost impossible that I could get pregnant I'm just looking for reasuence because I'm that paranoid and annoyingly a lot of the symptoms of being pregnant have other explanations as well (I have much more logical explanations for everything it might just make me feel better if I here from other people) the main thing that's freaking me out now is that my periods been due (I have super irregular periods anyway and I was on birth control) and now I think I have it but the bleeding is super light which isn't normal for me but I know it can be from birth control I'm just worried it could be implantion bleeding even though I know it's so unlikely (I use to just use the pull out method and even have been came inside of on my period and I never got pregnant) I was on the impanon in my previous relationship and it stopped my periods all together till I went off it but I wasn't on the pill (mini pill) for long that's why I'm thinking it could be from that😅