Okay i had sex 6 days before my period was exspose to be here then it came 4 days early. It only lasted 4 days... Could i still be pregnant. And the month before i had my period one day early and it lasted only 2 days i kept takeing test and they were negative. I had a miscariage when i was 15 i took 3 test and they all came up negative. My hgc level was low??? help