Patient's question:
Prediction is that sexual activity occurred on the third or fourth day before the expected menstrual period. However, four days after the predicted menstrual period, it has not arrived yet. Could I be pregnant? How can I check? Thanks :)Doctor's answer:
You did not have sexual activity after your "menstruation," which can rule out pregnancy, indicating that it was pregnancy before menstruation. The three days before the onset of menstruation are considered a safe period, and the possibility of pregnancy is low, suggesting it was pregnancy before. The last vaginal bleeding is considered a sign of threatened miscarriage, not true menstruation. Since menstruation is caused by the endometrium, while the fertilized egg needs to implant in the endometrium to continue developing.