Brownish Discharge around ovulation.

Hello Doctor, i am 25 years old and generally irregular cycle. I had my periods started last month 31jan and ended on 5th. This time i had 45-48 days cycle. I generally have 34-45 days cycle. After my menses ended i had light brownish discharge for a few days like it happens at the end of periods. That discharge turned white later like it happens normally. Till yesterday it was white but today i had dark browinsh dischrge with mild cramping (which sometimes happen during my ovulation) i think i am ovulating or going to ovulate. Is it normal to have this brownish discharge? have no other symptoms. No itching, no burning, no smell. Also, i am on some medication for stomach infection. I am sexually active. I got intimate with boyfriend two days after my menses ended and used protection.