Pregnancy Confirmation. Into pregnancy?

Hi, I had my periods on 1st of April for 5 days and i had an unprotected sex for just over a minute with my partner on 14th of April. I am not too sure if the sperm was produced during the intercourse or not. We again had unprotected sex on 27th of April but this time the sperm was released and so i took a i pill immediately after the intercourse. After few hours, i got bleeding and it lasted for 3 days with 2nd day being the most in terms of the bleed. 27th April is close to my menses cycle but usually my periods last for 5 days. I want to know if the bleeding i got was my periods or is it an effect of i Pill and also does this bleeding confirm that the sex i had on 14th of April did not turn into pregnancy? I am confused. Please suggest