health problem that could deal with my sex life

i have a couple problems. so one could i be pregnant? so a couple weeks ago (the 14th) the last day of my period me and my boyfriend couldn't wait. we had sex unprotected but he pulled out before he ejaculated. maybe about a week at most later i started having these odd stomach problems and it was only at night or after i ate alot but it was kinda a feeling of emptiness but i also stated to feel bloated and warn down. i thought the feeling of being warn down was just from the stress from school. but now im sick with something probably the flu my throat and head hurt. i also think i could have another UTI i had one about 1-2 months ago, but these symptoms are not exactly the same. i feel like i have too pee all the time like no relief from it and it burns a little when i pee and then also there is a very lil bit of blood on the wastepaper. i was also wondering if it is possibly if u could get a UTI if you had oral sex, or if u masturbate with a object the could potently have something on it. PLEASE HELP I NEED HELP :'(:-|