When a woman is 42 days pregnant, something brown comes out of the vaginal opening, which is called abnormal vaginal bleeding. The cause of vaginal bleeding may be a miscarriage or an ectopic pregnancy caused by a fertilized egg that did not settle in the uterine cavity. If you have brown stuff after intercourse, you should also consider localized cervical problems, such as the common cervical erosion or cervical polyps. So this time you need to go to the hospital gynecological examination ultrasound, but also check blood HCG and progesterone, if necessary, need to do gynecological internal examination to diagnose the specific cause of bleeding. If the bleeding is caused by preeclampsia and there is a need for fertility, it is necessary to consider taking progesterone to carry out the corresponding fertility preservation treatment.