Answers ? experienced ?

April 3rd I had A Period and it ended April 6th .. April 18 - April 25th I Had Sex .. April 28th I started bleeding, lightly the first two days the heavy after that which ended April 5th Now Today I Went to pee and when I wiped there was mucus with a string if blood , now I'm bleeding lightly .. Not enough to wear a pad or anything , I feel this is weird.. Like I shouldn't be bleeding AGAIN .. what could this be , anyone experienced this and was pregnant ?