Can I get pregnant ? HELP

Hi ! Okay , so for starters I was a virgin before this.. so my boyfriend and I were playing around Sunday night around 12 am , he actually came inside my mouth .. after that he wanted to put it in , there was no condoms so we agreed to just the tip in .. he tried putting the tip in but I guess i was to tight and didn’t go in . My point is , can I be pregnant ? My stomach keeps cramping and moving around and hurting from that day forth ???? Need I remind you as well that my fertile window started up today ... please let me know if there’s any slight chance ?