Welcome to the forum.
I pill intake has complications like nausea, vomiting, headache, pain abdomen, dizziness
, mood swings, loss of libido, irregular menstruation
cycles, etc. Since she is suffering from headache since 2 weeks, ensure that she is properly fed and well hydrated, let her take nutritious diet.
I pill is an emergency contraceptive pill
that should be taken only in emergency like condom rupture, unprotected intercourse
, forgot to take regular pills for more than 2-3 days, etc. I pill should not be used as a regular contraceptive pill.
Headache can also be due to stress, depression
, migraine, low blood pressure, gastric problem ( in few cases ). It will be good to let her eye's get examined by an eye specialist. Eye site problems are the commonest cause of headache. Take care.