So i have had my first depo shot and im due for my next shot in a few days and im worried i am pregnant. I didnt have any bleeding after a month and a half of it and then for about a month nothing then when i has sex i bled every time after for aprox 3 to 4 weeks and 3 days ago it stopped completely... last time this happened i was on the yazmin pill and i fell pregnant. I have had lower back pain and lower pains at the front. What do i do?