pregnant ovulation cramping

i had unprotected sex the day my period ended. i dont know if he ejaculated in me tho. for the next two weeks i was feeling fine. i had no pains and i didnt think anything was wrong. about 2 weeks later i had unprotected sex again. and my boyfriend claimed that he did not ejaculate in me. but ya never know. a couple days after that i wasnt feeling myself. to this day, about 14 days after the last time i had sex, i am still not feeling myself. i have cramping(not painful tho) i havent really been feeling nauseas tho. i recently got a pregnancy test and it came back negative. but i still have a feeling that there is a chance that i might be pregnant. there are some other signs that i have been having. like i've been tired, peeing alot, and cramping. but the one thing that is keeping me from thinking i am pregnant is that i am ovulating. now i know that you usually dont ovulate while pregnant, but i am. and i dont know why i am. it feels like i am getting my period, but its actually just me ovulating.