You must quit smoking and drinking for more than 3 months before you can get pregnant, and you can’t get pregnant if you quit drinking for 15 days. The growth cycle of sperm and egg takes 3 months. It takes 3 months for the egg to develop and mature from the beginning of development to ovulation. Smoking and drinking within 3 months may cause abnormal egg development or abnormal ovulation, and you have to quit smoking and drinking for more than 3 months to have a healthier egg. Sperm and egg growth cycle is basically the same, during the preparation period both men and women should quit smoking and drinking at the same time, must change the bad lifestyle do not labor and stay up late.