Are you late for your period? You can take a HPT as early as one day late, but some women have to wait even longer. Are your periods pretty regular? If you had unprotected sex a few days after your last period started and your periods are on a 28 day (or shorter) cylce then you have a good chance of being pregnant. Sperm can live inside you for up to 5 days so you could pregnant in the few days preceeding ovulation. If you know when your next period is due and it comes late then take a test. That's the only way to be certain. If it's negative, but you still don't get yourperiod, wait a few days and test again.
Where is the blood coming from? Sounds like you have a urinary tract infection for one. Some pharmacies have UTI test kits for sale over the counter. They are made by AZO and AZO also makes a pill to help clear up the symptoms but you would also need an antibiotic. As for the possibility of pregnancy. I agree with the other poster, take an HPT. Then you will know more of what you are dealing with. I also suggest that you schedule an appointment with a GYN for an Annual exam. This will clear up all of your questions and all women should have them to maintain good health. Hope you feel better soon.
I was thinking the same thing either a bladder infection or a uti. get it checked out becuase it will only get more painful.. speaking from experience.. OUCH!
I agree that it sounds like a UTI. You need to see a doctor for diagnosis and an antibiotic, because untreated UTIs can develop into kidney infections.