Lubricants should not be used during pregnancy preparation because some of the ingredients in lubricants can affect the quality of sperm, so they should not be used. If you have a health checkup during pregnancy preparation and your sex hormones, thyroid function and estradiol are normal, your vaginal secretions will not decrease, so you don’t need to use lubricants during sex, because vaginal secretions can maintain the lubricity of your vagina. So there is no need to lubricate the vagina with lubricant under normal circumstances. It is recommended to pay attention to personal hygiene when having sex, both spouses should wash their external genitalia and not to stand immediately after intercourse during preparation for pregnancy to avoid reducing the chance of pregnancy.