PLS HELP..DON'T IGNORE..am i having UTI or STD or any other problem ??

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severe back pain & lower stomach pain. is it have anything to do with sex ?
I am suffering from back & stomach (pelvic part) pain from 3 days. Before that i had itching around my genital area for 2-3 days. I recently had a hard sex with my partner.3-4 hours after sex i had a lower stomach pain & that same pain is going on now...i had my period on 15th feb & i had sex on 22 nd feb.it was an unprotected sex but we both are having unprotected sex from 1 yr & he withdraws before ejaculation. I am not doubting that i am pregnant bcoz i didn't had any symptoms of pregnency...but is this stomach & severe back pain is the symptom of pregnency ???

I do exercise & dance during my free time. I use to move my belly area. Is it have anything to do witmy pain. But this type of pain is arising for the 1st time thats why i am little worried and asking this question.

I have said all my symptoms & things i have done so far. Now pls help me & tell me what will be the problem ??