Plan b morning after pill

So I ended my period on April 8th I had unprotected sex on the 12th of April took plan b morning after pill on the 13th started bleeding on the 13th of April for 5 days very heavily and ended my period on the 22nd of April had unprotected sex on the 24th thinking that I was was not going get pregnant because of the pill I took a pregnancy test and I am pregnant the question is am i pregnant from the first time or the second time because when I took the pill I did bleed a lot it was very heavily I was about to go to the hospital so I'm guessing the pill did work at that time and I got pregnant on the 24th help ? What do you ladies think?????? Oh and I took the clear blue weekly test almost 2 weeks ago and I said I was 1-2 weeks pregnant I'm so confused