Could i be pregnant????

Im on birth control and never forget to take it. Me and my bf have had unprotected sex a lot and now im having a gooey brown discharge and bad cramps. I have a low appetite also. Could these be signs of pregnancy? Part of me thinks its just my period tho because those same symptoms happen when im about to get my period and i took 2 pregnancy tests that were both negative. The only reasons i feel it could be pregnancy this time is because i've had this discharge for about 3 days now and it hasnt turned red. Usually it turns red the same day or day after the brown starts. Also i just had a 3 month long period not too long ago and i only have about 2 or 3 periods a year due to birth control. But the cycles are usually spread out over longer periods of time. My last period ended in March or april, so it shouldnt b time for another one yet. Am i preggo? If not, whats wrong with me? I plan on goin to a doc soon. I know i should, so please dont tell me that. But n the mean time, any ideas what it could be?