Nausea remedies?

Kristi • I'm a stay at home mom to a little boy who's 2 years old. I'm currently pregnant with my second who is due 10/17/16.
Today my Dr suggested vitamin b6 and doxylamine/unisom(which is a sleep medication) vs zofran as I took with my first. Has anyone taken these to help with nausea? Vitamin b6 makes sense to me but not the doxylamine