Etonogestrel
"So I had it inserted on the 6th day of my period. I think that's why I had issues with it. You're supposed to get it inserted earlier. Anyway, insertion didn't hurt but my arm was pretty sore after. My first period came on time and was the normal 7 days. I was used to 5 days because I was on the pill prior but still 7 wasn't terrible. The next month I didn't have a period I was super excited. I thought that meant I wouldn't have it from then on out. I was wrong. I got it monthly until about 5 months ago. It went from 7 days to 9 days. It got super heavy and unpredictable. I'd have it for 9 days then get it again a week later. Then it started lasting 10-15 days. I was moody and crying. I had it taken out."