had anyone else had this happen?

before I had my daughter(who is now 19 months) I was on the depo for a year. I went off of it and it took a year for my period to come back but once it did it was regular then 2 months after getting it back I was pregnant with her. Now I went back on depo when she turned 9 months then stopped it again after 2 shots. I had my first period since stopping it on June 14th and it last 7 days. I did ovulate around the 23rd and my SO and I did dtd. I was supposed to get my period on July 12th and it's been a week and nothing has come. no cramps, just some breast pain. I even took a test and it was negative. I'm so confused. My periods have always been spot on every month no matter what.