I am 8 weeks pregnant. My ultrasound showed one baby. Could the ultrasound be wrong? Extremely sick!!?

I am 8 weeks pregnant. My ultrasound showed one baby. Could the ultrasound be wrong? Extremely sick!!?
Question by Stacey:
I am 8 weeks pregnant on October 14th and I have 7 month old twins as well as a 7 year old daughter. We found out earlier this month we were pregnant and we had an ultrasound last Wednesday that detected only one baby and sac. I have been having the same symptoms with this pregnancy that I had with the twin pregnancy. Could it be possible that the ultrasound missed a

ultrasound physiotherapy