The effects of not knowing that you’ve had intercourse on the 10th day of pregnancy are twofold: 1. It may cause contractions, abdominal pain, vaginal bleeding and other signs of preeclampsia.2. It increases the chance of infection. If the above symptoms of abdominal pain and vaginal bleeding do not appear there is no need to panic, only need to know in the first trimester of pregnancy try to avoid sexual intercourse, avoid doing heavy physical work, pay attention to nutrition and rest, and regular maternity checkups can be done, you can go to the hospital for a blood pregnancy test, to understand the growth and development of the fetus. At the same time, you can do ultrasound to understand the development of the embryo, if everything is normal, you do not need to worry too much.