Is It Normal To Have Spotting On The 11th Day Of Taking Diane 35, Or Should I Take Medicine To Stop The Unusual Discharge?

Good afternoon doc/dra. point of concern im on my 11th day of taking dianne 35, this is my 3rd pack, had sex last night and now i experience spotting. Last time every 4 days before and after my menstruation there is brown discharge sometimes pinkish brown is that still normal Or any new medicine to stop unusual discharge or bleeding. Thank you.