Delayed menstruation with blood for a day may be caused by pregnancy, irregular menstruation.
If your period is delayed and you have intercourse during ovulation, consider the possibility of pregnancy first. After pregnancy, there is a blood discharge, which may be caused by preeclampsia, ectopic pregnancy. To go to the hospital to draw blood, early pregnancy test paper, etc. to check whether the pregnancy.
If pregnancy is ruled out, and menstruation is delayed and accompanied by blood, it is possible that menstrual irregularities may be affected. Ovarian endocrine disorders, caused by the endometrial exfoliation of the amount of small, that is to say, leading to menstrual flow is not smooth, the phenomenon of a small amount of vaginal blood. Observe for the time being, slowly the bleeding may increase.
The specific situation should be decided by the doctor’s consultation. Be careful not to exercise strenuously and change your underwear regularly.