You did not tell us when did your period start after taking plan B because blood from menses can contaminate the urine. However, if other symptoms of cystitis resolve, only pink urine or urine with streaked blood remains, you should be fine after 5 days of nitrofurantoin.
Answered 5/16/2022
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Collect urine in a way that your vaginal contents dont contaminate it and have it checked. For there is a possibility is that your urine specimen was contaminated by your period.
Answered 5/24/2022
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