The period before ovulation is called the prodromal period. During this period, a woman's eggs are released from the ovaries and begin waiting in the fallopian tubes for fertilization. The prodromal phase usually lasts 3-5 days and is one of the important periods of pregnancy.

If a woman is fertilized during this period, the fertilized egg will enter the uterus, implant in the uterus, and begin to conceive the fetus. If a woman is not fertilized during this period, she misses the opportunity and cannot become pregnant.

The prodromal phase is very important for women to become pregnant, so women need to pay attention to seize this opportunity to allow the egg to wait for fertilization in the fallopian tube. If a woman is not sure whether she has fertilized during this period, it is recommended that she get a fertility test to make sure she is pregnant.