Following taking emergency pill, period may be delayed or irregular due to hormonal
imbalance and mental stress
You got brownish flow which is withdrawal bleeding of the pill. It is quite common and natural phenomena.
Your period may be delayed for 1-2 weeks from expected due date. You need to undergo one home pregnancy
test in case of delayed more than 1 wk.
Practice safe sex
in future. Avoid mental stress. Good luck.