What Causes Brownish Vaginal Discharge After Taking I-pill?

hello doctor..i hv taken i-pill within 24 hours of intercourse.actually that was not full intercourse..it was only for few seconds..but i didnt take any kind of risk and took an i-pill..now today after 6days of taking i-pill there is a light brown discharge and it is very little..after few hours it stop..is it normal?