I need advice please!!!!

I was hanging out with this dude one night and it was right after my period and usually that’s when the app says I’m fertile and I basically was making out with him and he was a nice guy so I didn’t think he’d do anything and I told him not to but basically he stuck the head in and I told him after that he needed to have a condom but idk cause I was a virgin and he just kinda did it or whatever and I know he didn’t cum in me but I’m nervous cause it was my fertile period and I read pre cum can get you pregnant and I’m like already a day late and I need some advice