Ok so I had unprotected sex on june 16, and i took the plan B pill on the 18th. I started my period on the 26 which is around the time when it was supposed to start. So it started off normal, then this morning i woke up and the blood was brown and i wasn't really bleeding anymore. Is it normal for the brown to be brown? Also, will my period be shorter? Because i usually only have brown blood near the end, but mine usually last about a week and its never this much brown blood in the first place. Also, does it affect the next periods?