GIRLS HELP ME IF YOU CAN!!

So I had unprotected sex and this is me and the guys FIRST TIME... and we did it around 12:30 at night so it was practically Saturday.. he said he came inside me for two seconds but I was confused cause I gave him a handjob literally a minute after and he came ALOT and I mean a lot.. but anyways with myself being a panicker I went to the pharmacy the next day got the Plan B.. but also to mention when I did it that Saturday (23rd Dec) my period wasn’t due until Christmas Day or the next day.. so I’m I okay or pregnant??