During pregnancy, many couples are afraid to make love, so as not to provoke contractions and premature birth. Modern medicine considers this a misconception: during sex, the uterus and placenta experience vibration no more than during normal walking, and the process of childbirth will not start until both bodies - mother and baby - are ready for it.
In general, the position of doctors is this: you can and should have sex, provided that the pregnancy proceeds without complications.
There is an opinion that sex in the first trimester on the days of menstruation (corresponding to the cycle before pregnancy) can increase the risk of miscarriage. Statistics show the opposite: most cases of spontaneously terminated pregnancies occur due to congenital malformations, when the wise body of the mother itself makes a decision about the non-viability of the fetus.