Back pain plus peeing often; thin watery milky vaginal discharge but no odor. What might it be?

2 problems? Back pain and frequent urination usually indicates a possible bladder infection. Watery vaginal discharge indicates a possible secondary infection unrelated or just hormonal changes. Need to be seen by a physician.
UTI. Possibly a urinary tract infection (uti) that causes urinary frequency, burning on urine passage, and if it ascends the urinary tract, back pain as a possible kidney infection. The thin vaginal discharge needs assessment also. See a md soon for rx.

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White and watery vaginal discharge, lower back pain, irregular menstration, pain before and after menstrations.

Evaluation. Hi, You better go for a pelvic exam, most likely an infection, you need evaluation and treatment, Do not wait up to see a doctor.