First of all,you have to know clearly one thing that I-Pill is not a vitamin tablet.So your girfrnd should not have to take 6 I-pill and it was your fault of knowledge. It has some side effects if taken more.
I-PILL is an emergency contraceptive pill
and have to take ONE PILL within 72 hrs of unprotected intercourse
which is enough. It prevents pregnancy
At present,girl frnd presents with 1 & half month amenorrhoea. So you have to do a urine test for hcg immediately. And if negative,then repeat it with blood test
If both are negative,then do a usg & thyroid test to rule out other causes.
** The side effects that some women may have after using the tablet includes:
1)Irregular menstrual bleeding (delayed or early)
2)Nausea, weight gain, headaches, dizziness
, and breast tenderness
All the best.