Hey guys! So I think I’m worrying myself too much but I need insight!

Im on combo Birth control pills and take them pretty regularly. I went home from college to celebrate early valentines with with my BF. I took my BC pill an hour late on Saturday because I didn’t have them on me on and took it on time Sunday. Today (Monday) we were having sex before I came back to school and we didn’t use a condom (he came the night before with a condom if that matters) and we both orgasmed at the same time and my legs were too weak to get off of him on time and I think he came inside of me (he says he didn’t fell like he completely finished🤷🏽‍♀️) so within an hour maybe 45 minuets later we went and bought plan B because he’s never finished inside and we usually always use condoms and still pull out even then 😂 I’ve been having mild period like cramps after sex and the pull! my last period was 4 days ago....... should I be scared for pregnancy?