I have a history of UTI's, bladder and kidney infections since I was a child. How do I know if I am liable to get pregnant or not?

OK to becom pregnant. If you are treated and there is no sign of infection there is no problem to become pregnant.
Pregnancy and UTI. as long as your cycles are regular and ovulatorty cycles and no history of pelvic inflammatory disease your chances of getting pregnant is equal to the females of your age group.