I have my period usually around the 6th of every month, my bf and I had sex on the 2nd of sept and 08/25-08/27lately Ive been feeling a heavy feeling like my period is coming but whenever I go check its just white discharge. I have a bubble stomach at the moment and am a bit nauseated. What could be the causes?
From the history given out in your question you will have to undergo laboratory test to rule out pregnancy. Since the symptoms like bubble stomach and nauseated sensations are bound to occur in the early pregnancy. So pregnancy test is advised.  Regards!