Just a question, kinda tmi but need to ask

My fiancé and I were playing around so, hand stuff. We were both naked (duh) and when he came, it hit around my lips but it was on my ass and he moved himself after a second and just cane the rest into some tissues. I kinda freaked out and was like “stop now” and he stopped and he was like “I promise it hit not as close as you think” and I freaked out even more but now I’m having back pain, cramps, period farts, period diarrhea, and a massive migraine. Usually what I get a day or two before my period, but I’ve already had my period this October? Someone think they can help? Our wedding is in May of 2019 and I already made many promises that I wouldn’t get pregnant until after we get married, and if I am pregnant I honestly would not be able to let anyone know except maybe his mother. I’m so so against abortion but I feel as though thatd be my only option if I find out I’m pregnant... I’m terribly sorry this is very long, but someone please help me haha.