an infection can throw your cycle off and make you late...I would follow the treatment for your bladder infection and once it clears up see what's going on with your body/cycle. If you're still have problems, ask your doctor to test HCG and if she still refuses and you're still having trouble, you MAY want to seek a second opinion. You should be able to trust your doctor, and if you feel that her judgement isn't entirely trustworthy, you may want to seek a second opinion for good and find a new doctor. But I would wait a few days and see.