Idk why I'm even typing this .

I'm just confused as hell. I got out of a very toxic situation with my ex of 3 years recently. About 5-6 weeks ago. We stopped having sex months before the breakup so ik it's not him who possibly got me pregnant.. but about 2 weeks after the breakup I was kicking it with another ex of mine from a long time ago because we remained cool and alright after our breakup , we ended up having sex one time and I didn't even think he finished tbh because the sex was so quick literally like 2 mins. Well here we are today and my period is a week late and now it has me thinking maybe he definitely just came quick and did it inside of me. I wouldn't be opposed to having a baby right now but I'm just so confused. I'm scared to test because I tried for years with my ex and never got pregnant or even had a scare but only one time with my ex and boom super late period. I also tried to rule out it being stress or whatever but I have been very happy since my split with my ex and life has been going good ,not many changes so I'm starting to get scared. Has this happened to anyone ?? Is there really a possibility I could be pregnant off that one time? I mean I am not tracking ovulation neither so it could be. I'm feeling so many motions