Periods and possibly

Nylah • I like to make people happy 😊

So I’m just wondering what could be going on... I still haven’t had my period I took a pregnancy test at the beginning of November it came out negative but I’m still not sure. I used to be on birth control up until August 4th but I was only on it to start my periods regularly cause they were irregular. Before that I didn’t have my period for 10months straight, that was before I was even sexually active. The days where you see a heart and white dot are the days I had sexual intercourse. Does anyone have any ideas on what may be wrong with me?