You should not have intercourse during the first and second trimesters of pregnancy because during the first trimester, the embryo has just developed and is not particularly stable, so intercourse stimulation can easily cause symptoms of pre-eclampsia, especially for women with low progesterone or a history of miscarriage, so you should not have intercourse during the first trimester. In the second trimester, the uterus is particularly sensitive due to the proximity of labor, and the stimulation of intercourse during this time can easily cause contractions leading to preterm labor, so try not to have intercourse in the first and second trimesters. You can have intercourse in the middle period, but try to pay attention to the time and rhythm of intercourse when you are pregnant, try not to be too frequent, the rhythm range is not too large, to avoid pre-miscarriage or preterm labor caused by intercourse.