I was on the injection for 12 weeks but in the last 5 weeks I had a constant period and in the last 2 weeks I had sharp pains in my abdomen and back only on a night and sometimes down below again on a night I went to my GP and he suggested I went on the combined pill this was the 12th week I went on the combined pill and I've took it without missing a day and I'm still getting pains but less regularly and now I'm late for my period could I be pregnant or do you think it could be something else I have a doctors appointment but it's not until next week and I have ordered a clearblue digital test online that I will recieve tomorrow as I won't be able to get to the local shop before it closes and the closest supermarket charges far too much for a little test I don't mind waiting a day for.