Is Prevacid (medicine for acid reflux) ok to take during pregnancy?

I don’t even know if i’m pregnant yet. Thats not my question. My question is: i take Prevacid every day for my Gastro esophageal reflux disease (heartburn times 100) i can’t live without it. my reflux is that bad. but if i get pregnant or if i already am does anyone know if it will hurt the baby? or if there is something else i can take? over the counter prilosec, tums, mylanta, –none of that works, its not strong enough. has anyone had this problem? if its really bad i will not take it obviously the baby’s health is more important but i need to take something. any ideas??