Yeast infections and urinary tract infections (UTI's- though I wouldn't say your symptoms suggest one because you'd likely experience pain on urination) can be common for those new to sex.
To start with, make sure you're urinating shortly after each instance of intercourse. One major way that these things get started is the pathogens that create these problems get to hang out inside the vagina, or even migrate into the urinary tract. By urinating shortly after sex (within an hour or so, please do not freak out and run to the bathroom the second after you've finished
), you help clear the urinary tract of anything that may have started to hang out near or just inside the opening of the urethra.
Then again, some women just seem to be extra prone to UTI's and yeast infections, no matter how diligent they are about urinating after sex, cleaning, etc.
As mentioned, it could also be a host of other things- latex sensitivity, sensitivity to the spermicide on the condom (if you're using the kind with spermicide), sensitivity to any lubricant you might be using...
Anyway- go talk to your doctor. Now. Quit wasting time on tests and actually go see a doctor to diagnose the problem. If it's either a yeast infection or a UTI, they're easily treated- but nothing should be ignored or pushed aside.
It's really good that you're so careful with your health by making sure that your boyfriend got tested and all, but if something is going on, you need to just go see the doctor already and don't waste time.