I'm 18 weeks 6 days twin pregnant. I have seen two to three drops of blood after getting up from bed on my Nighty and on bed sheet. I then informed to my doctor, she told me to meet her immediately. She then did Doppler test And internal check up and asked me to do ultrasound check up if I do spotting one more time with in a week. Is anyone facing the same?   What's wrong with this ?