Free ultrasounds??

Natalie • Mommy to an angel baby up in heaven. Expecting our rainbow July 2016 👶🏽! Wife to a soldier. ❤️
I've been reading that some people have had an ultrasound for free at a clinic. There's a clinic in my town that offers them and I was wondering if they're legit? Do they actually do them and are accurate? Do they tell you what they see and everything??