My friend had her cycle and it was only two days but she's normally three please what's wrong and she's been seeing clear mucus in her blood is it ok?

Most likely: This is fine, and for so e reason she had a lighter period this month. If she has been sexually active though, and had unprotected vaginal intercourse she may wish to take a pregnancy test at home just to be sure. If she is in a monogamous same gender relationship ship than there isn't a concern. If the mucous continues to be blood tinged, she needs testing for sexually transmitted infection.Bwell