Suggest Treatment For Heavy Bleeding During Menstruation

I got my period on the 18th of february and then start gettin lite and i thought i was gone off by the 23rd, i had sexual intercourse on the 27th and i bleed right after sex and now 4 days later march 2 i am bleeding enuff that I am using a tampon its a flow like a regular period but i went off almost two weeks ago whats wrong with me?