I got on the birth control January of 2015. It was the depo shot. I got off of it about the third week in March of 2016. I took a pregnancy test and I got a very faint line, hardly visible. But it was within the time frame. If I am I would only be about 3 weeks.... I have been feeling nauseous and getting headaches but I think it's all in my head. Pls help!!