Missed period

So my last period had been in December but I got my period twice that month. One time the first week of December and the second around the 26th. In January I was enrolled in a 5 week anatomy class and my stress levels were super high because we had quizzes or tests every day so I was beyond stressed. I ended up not getting my period. So then I thought it was because of the stress. February came along and I didn’t receive it as well. I am super freaked out and don’t know what to do. It has been 2 months I haven’t gotten anything and I’m super scared. I am also on birth control so idk if that may be affecting it.