I'm glad you went to the Dr.
UTI's are like a rite of passage. I had my first one in the Bahamas whilst vacationing with a boyfriend. Nothing like having your very first internal exam with a Bahamian Dr. The office had no bathroom so they gave you a cup and a brown paper bag and sent you across the street to a business so you could pee in the cup and bring it back. I got the "pee after sex" talk too.