I need help

I am so confused so January 1st I had sex my man nutted in me I got my cycle the 2nd took a test on the 14 of January it it said not pregnant so here come February the 2nd we did again he nutted in my cycle came on February 7 and again so my boyfriend again nutted on February 14 and the 15 idk what’s going on why it’s not working but I am feeling like cramps but I always cramp and my cycle are not regular because I remember I had skipped my cycle in December of 2024 never came on