My cycle ended on 3rd july and I had antibiotics from 3rd-6th july. 10th july onwards, there was a brown discharge on wiping with a tissue. The flow increased and I had to wear a sanitary napkin from 18th-25th the flow was like usual periods but not red. I had indulged in imtercourse on 7th june but had my usual cycle in the month of June. I also feel dizzy and nauseous the entire day. I have recently started working though, been a month. My routine has changed completely since 18th June. What could the possibility be and how to treat it?