From what you have described there has been no bleeding after sexual intercourse, hence it means your friend hasn't got her period yet. She must take a urine pregnancy test to see if she is pregnant or not. A blood test recommended by gynecologist is a sure way to confirm pregnancy or absence of it.
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First day of the periods is a nightmare. Extreme pain. I have been also admitted 5 times due to low blood pressure and acidity...
I get very less bleeding during my period. Also, the bleeding is sticky and irregular. Why it happen?