I was given antibiotics for an STI I also take birthcontrol my cycle is suppose to start but I only get dark brown discharrge and very little blood?

Do HPT as needed... Antibiotics for UTI alone will not alter period regularity, and birth control pills and body overall health stability will. However, it is still always do HPT in 7-10 days after missing expected period and repeat it in another 7-10 days if the first HPT is (-) & still in doubt, since no contraceptive brings 100% success but abstinence. So, seek evaluation & counseling so to sort out what might ...