I've been on Depo for four months I missed my depo last month and I got the shot again this month , I've been have really bad cramps always tired and feel sick all the time and always have mood swings I already have 2 kids my youngest is 1 years old if I'm pregnant I would be three weeks but I just don't know if I am because I've been on the shot for 4 months and missed last month can I be pregnant ??