In September i had unprotected sex, he didn't ejaculate inside me but i still took the pill. after that i received my period earlier (like a week after taking the pill) and after that my cycle became of around 30 days regarding the last period i had (the one after the pill) i was supposed to have my December period about 6 days ago. i have been involved in sexual acts but no unprotected sex and it wasn't on my fertile window regarding the new cycle. What could be happening, should i take a pregnancy test? is it another health problem?