you didn't mention anything about your marriatal status,
the general possible causes for your bleeding are,
- ovulatory bleeding, which can occur in the middle of the cycle.
- in case chances of pregnancy
is there it can be implantation
-if on contraceptive
pills it could be withdrawal bleeding,
-it can also be post coital bleeding in sexually active women,
if the bleeding not getting controlled you better visit gynecologist once and get examined to find out the possible cause,
and treatment can be given according to it.