kinda confused with my cycle.

okay. so i stopped bc about a year ago. my period stayed pretty regular for a while after until i got on antidepressants which was about 3 months ago. when i started taking the medication my period cycle got allllll messed up. the first month i started ten days late. and my period wasn't very heavy. i may had a period for like 4 days. my usual periods were kinda heavy and lasted about 4 or 5 days. then the second month i didn't start about 8 days late and it was a super light period like it was barley anything and it lasted 3 days. this month i have been extremely bloated for a couple weeks and i wasn't suppose to start till like 5 days from now and i started yesterday for a little bit and then it stopped and today i have a little bit and then stopped again. WHATS HAPPENING!?