Had an unprotected sex on the day my chance of getting pregnant was very high and took a birth control pill. after some few days,my period came ?

Some thoughts...: If a woman has a regular normal period after sex, then she is not pregnant. If she cannot be certain that her bleeding was a normal period, then she could possibly be pregnant. A urine pregnancy test (available in stores everywhere) done 3 weeks after the last time she had sex will give the answer. Be sure to read the instructions and do the test correctly.