Hello dear
I understand your concern
There is always some chance of the
pregnancy in unprotected sex.
Sometime precum enter in to the vagina unknowingly before the ejaculation.
So you have penetrative sex and so there is chance of the pregnancy.
So better to take I pill with in 24 hours of sex.
But it can be taken upto 72 hours of the sex to prevent unwanted pregnancy.
So main thing is the day of
menstruation when you did sex.
If you have did sex in safe period of the cycle then no need to take pill.
If you have did sex in fertile phase of the cycle (10th to 20th day of cycle) then take pill.
No any harm in taking
emergency contraceptive pill and it has just few minor side effects in some cases.
If you do not want to take pill then only option is wait for the period to come.
If you will pregnant then you have to take
abortion pill to terminate the pregnancy
Avoid
stress, take healthy diet, drink plenty of water and do regular exercise.
Hope this may help you
Contact further if follow up needed
Best regards
Dr. Sagar