I am a current Ultrasound student(2nd year), I'm in the same boat as you. I wanted to be a neonatologist, but 16 years is a lot of schooling and happy I found out about the neonatal nurse which is basically the same thing. So what I am doing is finishing my degree and going for the neonatal nurse so i have 2 options and 2 degrees.
ULTRASOUND IS VERY VERY HARD,TIME CONSUMING, AND WILL MAKE YOU QUESTION YOURSELF!
you will never truly understand everything about ultrasound, it's always a challenge and you'll even see new things! and trust me if you are unsure of this or maybe dont "love it" then it's not the right career for you..because you will end up quitting due to that. I came into this program to do OBGYN because i love working with babies, I job shadowed in high school at both maternity and ultrasound. Both great places!
Level 1, you won't find many jobs (only luck will help you here basically)
you need to do level 2 or 3...there are schools that you can do this in 2years.
there's also a neonatal nurse practitioner almost the same thing, paid more..may have more available jobs!
& final note: RESEARCH RESEARCH RESEARCH!
be happy with your decision!