Women usually ovulate only one egg per month, but occasionally they may ovulate two eggs at the same time, so it is common to see women getting pregnant with singleton babies, and occasionally twins, because only one egg is ovulated each time, and only occasionally two eggs are ovulated in unusual circumstances, and twins are conceived at the same time. Therefore, it is generally recommended that the best time to conceive is within 24 hours of ovulation, when the ability of the egg and sperm to combine is the best and optimal. If you want to prepare for pregnancy, you must take folic acid to prevent fetal neurovascular malformations, and quit smoking and drinking.