On May 11th, Monday, I started feeling lower abdomen pain and tho...

On May 11th, Monday, I started feeling lower abdomen pain and though it was gas. When I went to the doctor the next day, she took a urine test and told me I had a bladder infection. She prescribed Sulfa for 5 days, 2x a day. This is my last day and I have one more pill to go. The first day I took it, I woke up with a stiff neck. I thought I was getting better until this morning when, for the first time, it actually burned to pee and there was some blood spots. In addition, my stomach has gotten much larger than it ever has even when I gain weight. I feel like I might be pregnant because a few weeks back I was intimate with a guy and he placed his penis firmly on the opening of my vagina and was there for a while. He did not penetrate because I am still a virgin but could it be that sperm from his pre-cum might have entered my birth canal? But if my doctor took a urine test 10 days after that incident and nothing showed up to show I was pregnant, could it be because the pregnancy hormone wasn't at a detectable level yet? I have no idea. I just know that I am usually a very healthy and clean person and this has just thrown my body off track and I'm freaking out~