I've been on the shot for 1.5 yrs and so far I love it! I was late for my shot by 4 days on one occasion (they gave me the wrong date), and they made me abstain from sex for 2 weeks (yah right) and come back to take a pregnancy test before they would administer another shot just to be sure i hadent become pregnant while i was unprotected for those 4 days. But, since youre not having sex, you might not have to worry about all that.