I'm 18 and for the past few days I've been having an on and off pain in only my left breast, mainly the nipple. I should be getting my period within the next few days but this doesn't feel like my normal PMS breast pains. I've been on Estrostep birth control for 2 months and I'm also diabetic, I'm not sure if they would have anything to do with this. I know this isn't much information but I'm very worried.
Could this be a symptom of pregnancy? I had my period on time last month, but it was much lighter than usual and only lasted about 5 days. I've had no other symptoms of pregnancy.