Is there a chance of getting pregnant one day after your period?

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Me and my boyfriend had an unprotected sex one day after the last day of my period. I took pills immediately. And never take pills the following day. Is it possible thst i could be pregnant? Because after 7 days i had my period again. So i already have 2 periods within this month only. What shall i do? Am i pregnant? Can anyone who could help me here