Feeling extremely sad...

Period was 2 days late, got 2 positive tests followed by 3 negatives. On the 5th day late I had sharp pains in my lower abdomen and when I went into the bathroom I had started my period and it was heavy with alot of dark clotting. I think this was a chemical pregnancy and I'm totally heartbroken about it. My last depo shot was in January of this year and I read that when you are coming off the depo shot it stops acting as a contraceptive but still terminates your pregnancies very early on. (I never would have gotten it had I known all the horrible things it does) even before my positive pregnancy test I knew I was pregnant. I am a perfectly healthy 22 year old woman. I take prenatals and other vitamins everyday and have a healthy diet. Has anyone had any experiences like this after depo and should I wait longer to ttc?