Help! I'm Confused

Kat
I had a miscarriage on March 15, 2015. Period came back on April 16. Then May 17. I started BC shot (Mesigyna) the 18th, period came on June 16th placed BC shot on June 20th some spotting period like on July 8th lasted for 4 days. BC shot on July 20th. Period on August 8th didn't place any birth control shot on August. Then some spotting from September 13th til the 17th or 18th. But no period. Did two pregnancy test on September 14th both came back negative that was around 22dpo now today September 27th 35dpo some pinching on stomach, light nausea, and some fatigue. Thank for your time.