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You still could be pregnant. My bf an I had sex an the next day I started my period. Granted it wasn't a "normal" cylce though. It was messed up. I waited about a month in a half an took a test that came back positive. I wish you the best of luck!! :-)
it's not really that simple, you need to find out when you ovulate, not every woman is the same. It takes time for implantation and everything to occur, no way you would know in a day :PGood luck!