Hi My Period Came On April 1st And Finish The

Hi my period came on April 1st and Finish the 7th which was the Thursday .. On the Friday I had unprotected sex and took postinor 2 on the Saturday which was the 9th of April .. On the 14th of April I realized blood spots in my underwear and on the 15th (yesterday) the flow was even heavier like my period .. I'm currently still bleeding could you tell me what is happening ?