Thank you for the query.
Pregnancy always should be considered, however such vomiting usually appears in the morning.
Vomiting after an alcohol can be caused by peptic ulcer
or pancreas disease. Especially if you have been drinking regularly, have upper abdominal pain
which radiates to the back, have had chest burning or acid reflux
It is advisable for you to have pregnancy test, abdominal ultrasound
, liver tests and amylase level checked.
Hope this will help.