please help me

hi, so i am sixteen and something really scary happened last night. i dont know what to do and i’m really hoping someone on here can give me some advice.

so last night my bf and i had cat sex. i only lost my virginity a month ago, but have kinda gotten used to it. but last night when we went in it kinda hurt a lot. i thought maybe it was just the position and lack of space. anyways, he fucked me for a few minutes. and then he pulled out. when he did he said the condom was halfway off. i dont know if it just started to slide off when he pulled out or it’s been halfway off for a while. when we took it off, there wasn’t much cum in the condom but he said he thought he came but wasn’t really sure. we filled the condom with air (don’t ask how 😭) to see if it may have broke. no cum came out of it, it remained dry. we didn’t look for any holes though. i stuck my finger in my vagina and what came out looked kinda like his cum, just more thick. but it didn’t look like my cum either. i dont know if it was cum, with me being wet and maybe discharge. or if there’s a chance it was him. eve has said that i’m at the peak of my fertile window so i assume this is the highest chance of me getting pregnant. now, today i’ve had continuous pains in my lower abdomen all day. not really like period cramps because my period cramps come and go. i dont know if it was just because it hurt last night or for some other reason. we didn’t use any other form of birth control, just a condom. i considered going to get a plan b pill but didn’t. now im really scared but i dont know if im overreacting or not. im supposed to get my next period in thirteen ish days.

can someone please give me some advice?