birth control
"I had one shot and came on my period about two weeks late then was on/off quite heavily for the rest of the 3 months, I was on more than I was off in all I think I was off for about 4 days give or take. It’s been a year since I last had the shot and my periods still aren’t fully back to normal, I used to be extremely regular, I now come on twice a month, and never know when am going to come on! 
I wouldn’t recommend this to anyone"