Thanks for writing in.
You might be experiencing side effects of the morning after pill. Slight cramps and mild vaginal bleeding are side effects of morning after pill. Do not worry about it. It will subside on its own.
Meanwhile, keep yourself well hydrated by drinking plenty of warm fluids, like warm water, green tea etc.
If you don't get your periods even after one week of the expected date of periods, please get a urine pregnancy
Hope this helps
Dr. Divya Kuttikrishnan