The third day of bleeding after ovulation can not determine whether the pregnancy failure, the third day of bleeding after ovulation to consider with the ovulation of estrogen and progesterone peak endocrine instability caused by, and whether the pregnancy is not much to do with. The third day of bleeding after ovulation has little to do with whether or not you’re pregnant, with the peak of estrogen and progesterone hormone endocrine instability during ovulation, even if the ovulation coitus pregnancy endocrine instability may be a small amount of bleeding, bleeding on the third day of bleeding after ovulation can not be sure whether or not you’re pregnant. If you want to know if you are pregnant, it is recommended that you take a blood test one week after ovulation to determine the blood HCG, and during the preparation period, it is recommended that you monitor the development of follicles by vaginal ultrasound to determine that the follicles are mature and in time to have intercourse with a higher probability of pregnancy and pay attention to maintain the hygiene of the vulva in order to prevent infections.