my question is were u a virgin when u had sex or not.. if u hadnever had sex before, the whiping issue is perhaps your hymen having been broken bleeding. and if he stretched youo alot you could have been torn a bit and that causes bleeding. and yes you can have some "bleeding,spotting" a few days after sex if it was your first time.. just a thought.
It sounds like just a bad UTI. If you are only getting the red spotting when you wipe then it is likely that you have blood in your urethra that is being expelled before and after urination. The brown color is blood mixing with urine. It will not always be red, kind of like when you get a brown blood during your menstrual cycle. Given the proximity of the urethral opening to the vaginal opening, it is also possible that intercourse could have made a tiny tear in the tissue around the opening. None of this is to say you could not be pregnant. Anytime you have intercourse you have a chance of getting pregnant, but the signs are far different than those you are describing, and take a few weeks longer to be noticeable at all.
I'm no expert, so take my advice with a grain of salt. I'm pretty sure signs of pregnacy don't show for several weeks, actually i don't think you can even get tested until after a couple weeks - as tests won't pick it up.