Usually, the egg is viable for 24 hours after ovulation. The survival time of the egg after ovulation is very short, while the survival time of the sperm in the woman’s body is 24-72 hours. The umbilical end of the fallopian tube picks up the egg soon after ovulation and the egg, with the oscillation of the fallopian tube cilia, reaches the abdomen of the fallopian tube, where it waits for the sperm. Women who are preparing for pregnancy can monitor ovulation by ultrasound or use ovulation test strips to get a general idea of the time of ovulation, and have intercourse 2 days before and after ovulation to have a chance of conception. However, when a woman has gynecological diseases such as pelvic inflammatory disease, tubal inflammatory disease, vaginitis, cervicitis, etc., the survival time of eggs and sperm on the one hand, and the collection of eggs and the rendezvous of eggs and sperm on the other hand, will affect conception. In addition, if a woman has not conceived after 6 cycles of regular intercourse according to the ovulation period after learning about ovulation and egg survival time, it is recommended to consult an obstetrician and gynecologist for assisted conception if necessary.