Ok so I got the injection for the first time in January and it lasts 3 months I was due for another shot back in April but don't want to get back on it because it just messed up my period.. Anyways I got my period last week and it lasted 6 days which is my usual cycle and since my period finished my partner and I have been having unprotected sex (all the time) and this morning I woke up with bleeding again. It's light so I am only using a liner.. Is it just because my body is coming back to normal from the injection or is there a possibility that I could be pregnant????