Is bleeding after sex dangerous?

Question
Let me ask that my girlfriend just finished her period for 3 days, we had sex and there was one time without using a condom, but I went outside and then used a condom again, and my girlfriend later After having sex for 2 days, brown blood appeared again but no abdominal pain or anything, only brown blood, what's wrong?
Nguyen Quoc Bao (1999)
Hello doctor. Is it okay if I bleed after sex? Thank you doctor.
Anonymous question
Hello doctor. I had sex 2 days after having sex and there was some painful bleeding inside the vagina. The first day it flows a little, but the second day it flows a lot. Bright red blood without clots. Can I ask if your vagina is damaged? Is there any other way to stop the bleeding besides going to the doctor? Thank you so much doctor
Anonymous question
Hello doctor. May I ask, I've only had my period for 4 days, but I bleed after sex, is it okay? Looking forward to consulting your doctor. Thank you.
Anonymous question
Answer
After sex, there is vaginal discharge with blood, which may be due to residual menstrual blood from the previous period, damage to the vagina and vulva during intercourse. The reason is often because couples do not know how, perform the wrong technique, the movements are too strong. However, the main cause of vaginal bleeding is women suffering from gynecological diseases.
Need to monitor for other symptoms, such as bleeding time, condition, accompanied by a different odor or color."