At yesterday's ultrasound the tech finds two sacs. Baby A has a strong heart beat of 173 and measuring perfectly. To our surprise there was baby B. Tech was surprised to find a heart beat of 95. Baby b is measuring almost two weeks behind baby A. Dr said the next 4 weeks was crucial for baby b. I have another scan next month. Has anyone EVER had this happen? I'm confused, worried, happy and so much more.