So I stopped my depo December 16 2014, I had only had one a shot and it gave me depression and weight gain.. well ita been about 2 months after I quit shot. My last period (which was lite) was the week of quitting depo. Dec.16...

Me and my SO are not using protection. I've tried taking a pregnancy test a few days ago but it was negative.. what could be causing my period to not.come back.??? I wasn't on the shot long. It was only one shot..