ladies help me

hey I have been pretty much everything to do with stress but I haven't had my period in 7 weeks and I am starting to get a little paranoid I have gone to a new years party but I don't know if you can get pregnant in a pool like we weren't doing anything but I was teasing him I think he may have ejected some in the water btw idk where to put this bit what should I do I am so freaking out about this.