Thanks for the query.
As both the depo and next choice
, there is possibility of prolonged side effects.
If you started depo during your menstrual period, it will give protection for the total month.
I that case no need to use emergency pill.
If you started depo in the middle of the month, then you may need additional protection in the first month.
Possibly the side effects may subside in 4 to 5 days.
If they persist or increase in severity consult gynecologist once.
After getting examined, you can take symptomatic treatment.