I need help!!!!

I need help ladies I can't remember but I think I had one DEPO shot back in June but never went back to get my second shot. I don't had my periods after that so I had assumed the shot was out of my system plus I was also ovulating Oct n Nov after my periods after my period in Nov I had unprotected sex and when my period was suppose to start in Dec it didn't my period is 29 days late and the first two weeks I guess I had slight spotting but it happened once in the day then stopped after a while the bloating the lower back pain sore boobs the harsh nauseous alight cramps had calmed down now my back don't hurt as much my boobs are slight sore my bloating gone done every once and a blue moon I'll slight cramps but nothing harsh I yet again peed on the stick and it shows neg.... I am trying to make a doc appointment next week