bladder infection sign of pregnancy?

i took three hpt and they were positive but the blood work was negiitve i know serum is more effective but i dont know i feel pregnant. also i had a uti and got meds and i finished them and went back to the doctor she said everything was fine. the next day i started feeling lik ei had to pee alot but nothing came out no pain. untill the next day. i felt i had to use the bathroom constant but nothing and it started hurting bad. it didnt burn tho. that night i couldnt sleep and everytime i went to try and pee blood came with it. i dont know what could be worng! any advice would be help ful