I have urinary problem

pyemail

Hi!
I have a small problem. I was just starting to take a birthcontroll pill, before my boyfriend and i were using condoms, and i never had any problems. However now when im on biorthcontroll pill my urine after sex burns and hurt so bad, that i constanly pee. I went to doctor for so many times and i was tested for stds but the test was negative. I have no idea what to do. Im very upset because i had this problem before but my doctors couldn't help me and now when we are not using condoms anymore the simptoms came back. Please help me. Thank you