You could very well have a urinary tract infection. When you have sex it is possible for bacteria to enter the Urinary Tract, which can result in a UTI. Drinking plenty of water and cranberry juice will help with a UTI but if it gets worse or does not start to get any better your will have to go see a doctor for some tests. Also any time you have intercourse please make sure your partner (boy friend) uses a condom. I wish you all the best.
Hi i would get a check over from the Doctor , you can;t be to sure , Plus for peace of mind , always Please use a condom , it save's all that worry , Please take care ,