had a miscarriage at 12 weeks, now I am pregnant again at 6 weeks, I had an ultrasound and I was pregnant with twins, one gestational sac 12-14mm with yolk sac, one 5-6mm sac without yolk sac and no embryo. The doctor said that my case has a high risk of miscarriage, scheduled another ultrasound in 1 week. I went to the doctor on February 28, this morning I went to the toilet and there was brown blood and mucus. Doctor, can you tell me if I have brown blood at 6 weeks of pregnancy, is it a miscarriage? Thank you for your advice.