Am i pregnant?

Catherine
Hey i took the postday pill the last month in march when i was ovulation because my husband cam inside me. But this month my period supose to come in april 18 and it came in april 13. My period was some little and the last day april 17 was very little like dropps and it was brown color, that day i had sex and he cam in me again. There is any possibility that i am pregnant?