Why Am I Bleeding After Taking Biotin And Vitamin Supplements?

i am 26,female. I noticed my vagina started to bleeding when i have been taken biotin and other vitamin(for hair growth) together for 4 days(3600mcg of biotin per day), is that normal? Bleeding is not like period, not too much amount.
1.Should i stop taking this supplements?
2.Can i restart taking biotin for less amount ( i think 3600mcg maybe too much per day)when bleeding stops? How much amount is recommend?