The unprotected sex was a bit dumb, especially if you're not trying to have a baby... Have you considered that you might now have an STD?
Anyway, you need to get yourself to a doctor. Get tested for STDs, take a pregnancy test, and also ask whether there are signs of any other infections like thrush etc...
The white discharge isnt anything to worry about by the way, it's pretty normal, it's more the unprotected sex that is the concern here