Hi, I had sex 3 weeks ago with my girlfriend and I've been worrying ever since. I have not noticed any symptoms other than having an itching feeling in my urethra but I read an article that said to drink a lot of water and it should get rid of the irritation. In which case it did go away. However, I just went to the bathroom maybe 30-45 mins ago and now I have to go again. Does that mean I have an std or is that an early symptom?