Quoting shes.so.vain:" if baby isnt cooperating, try coughing. that what my u/s tech told me and our daughter showed us all the goods. lol good luck! :]"
At my 12 week ultrasound our baby was sleeping and would not wake up! haha, I had to go for walks and for sugary drinks and snacks and still wouldn't budge. Fingers crossed it doesn't happen this time!