I was administered the depo shot for the first time in late October 2017. That was the first time I've ever been on the shot! Well, it was a horrible experience because of terrible symptoms like irregular bleeding, etc. I decided once mid-January came, I was NOT going to get the shot again. I haven't gotten a regular period this month. I've been having off and on spotting, usually triggered by sex, having it the following day. Is that considered a period? Or why am I bleeding? What's the cause?