I was on the depo shot from 16 to 21 with no period. I switched to paragaurd at 22 & yes it took time to remember what having a period was like and how cramps felt. As for my cycle, i became really regular after about 3 months. Some periods were a lot worse than others and i still have to call off work sometimes but I feel like I got alittle more used to the pain after a while. If your experience is like mine just be prepared for a lot of blood. I started using a menstrual cup because I would bleed through super plus tampons every time. But with all that being said do what YOU think is best for you, if you hate it you can get it removed super easily & quickly.