Welcome to HealthcareMagic forum.
Clitoral stimulation can cause some vaginal discharge
which is usually clear or pale white but can be brownish if you are near your menses. So please do not panic .
However since you haven't mentioned your age and menstrual history in detail it's difficult to comment on the cause of your irregular periods
and present period.
So if you should consult a gynecologist if this problem persists in future.
As of now , it's most probably a natural reaction and you can wait and watch for your periods to come .
Hope I have answered your query.
Wishing you good health.