Possibility of Pregnancy???

Megan
Hiya everyone!! Basically, I had to come off the pill on Tuesday, due to the fact that it has been giving me chest pains and breathlessness, and they have prescribed me a new one but I'm not allowed to start taking it until I return back from holiday in around two weeks time. This means that the last time I took my pill was Monday night. However, I've heard rumours that sperm can stay alive in you for 3 days ish, and my boyfriend came in me on Sunday night. I'm just wondering if there's any chance at all I could be pregnant as I really hope not!! (I was on a 21 day pill if this helps, and I had been on a break till Sunday night meaning I only took two out of a pack)