Am I pregnant or have i got an infection ?

the past couple of weeks ive been worried & too scared to find out the truth of whats up. I had with a condom the 21st feb but i think the condom come off or split..i was drunk at the time. i took the morning after pill but then come on early but really heavy for about 9days and im usually only on my period for around 4,5days light..it said on the morning after pill leaflet to see a doctor urgently if i get heavy bleeding but i didnt think anything of it until i started having a huge increase in discharge, been having to change my underwear alot its getting that bad. i dunno if the heavy period was caused by the morning after pill being taken & im not pregnant and its just an infection or the discharge is actually a pregnancy symptom ?