Hi,
Thanks for posting in HCM.
I understand your concern.
The medications what you have been prescribed by your
Dentist namely Doxycycline with lactic acid bacillus,
Metronidazole and B-complex does not cause
hematuria.
It could have been due to mixing up of menstrual blood during urniation, which could be mistaken for hematuria.
Also, you need to remember that certain manufactures of B-complex capsules and Metronidazole medication could cause alteration in the colour of urine like yellow - orange colour, which also could be mistaken for hematuria.
In case if this problem persists after you complete the course of medications, then the cause for it needs to be evaluated. Otherwise, you need not worry about it.
Hope the information provided would be helpful.
All the best.