Owwww!

So lately my bf and I have been having ALOT of sex and I am always careful to go to the bathroom afterwards... but for the last couple of days it really hurts to pee and we had to stop having sex because it hurts on entry... I'm thinking I have a UTI... and awhile back I was given some antibiotics for a UTI and I have a full round left...but it's very painful any ideas on how to make it stop hurting down there?