I am 27 years old and have been receiving the Depo Provera shot for about 7 years. I am very CONSERVATIVE and has only had 2 sex partners in my life, I have not had sex for quite a while and have unfortunately made a HUGE judgement error, I had unprotected sex and realized the day after that I was 21 days late for my next Depo shot. The only side affect(blessing) that I have from the shot is that it almost takes away my menstruation completely, since the first month I got the shot. I am freaking out, and worried about being pregnant! Its to soon for a pregnancy test so I thought I would find out your thoughts. What are the chances of me becoming pregnant after this 1 encounter? Please give your thoughts. Thanks.