Hello dear
I understand your concern
You had taken the I pill with in the 2 hours of the sex.
It is highly effective in preventing the
pregnancy. (95-97% success rate).
So it has just 0-5% failure rate.
Withdrawal bleeding will not occur in all I pill user and it has no relation in preventing the pregnancy.
I pill contain
progesterone and cause delay in period by 1-2 week and excessive bleeding can occur.
If your period will delay by more then 2 weeks then go for urine pregnancy test and or blood HCG test to confirm the pregnancy.
If you will become pregnant (very less chance) then still you can terminate it by
abortion pill under the advise of the gynecologist.
Meanwhile avoid
stress, take healthy diet, drink plenty of water, do regular exercise and eat healthy diet.
For allergy: take tablet
cetrizine and other treatment depend on the symptoms.
Hope this may help you
Contact further if follow up needed
Best regards
Dr. Sagar