Expert answer:
Nausea is a frequent side effect of the morning after pill. Vomiting, headache, cramps, dizziness, malaise and bleeding may occur before the normal day of menstruation with cramps or even menstrual delay. Menstrual irregularity is common after taking the morning-after pill.
The effects can last for several days or weeks. Nausea usually lasts only a few days, but bleeding can last longer.
