Help! Can I switch to Prevacid from Nexium?

Michelle • 25, Married, and can`t wait to meet our little baby :)
I've been on Nexium for a while now and my acid reflux is still really bad. Has anyone taken Prevacid? Is it better than Nexium? I need some relief now! How many milligrams do you take a day? Or if anyone else has anything that works better please let me know!