MAJOR acid reflux - how to relieve symptoms

I’ve always had acid problems ever since I was 18. Since I started my FET cycle more specifically the estrogen it has really messed with my stomach and I have super bad acid stomach. I’ve been eating small meals and eating really low fat and very bland mess but nothing seems to be helping. I got a positive pregnancy test a couple days ago so I don’t want to take anything I normally do for it. I just read that Nexium may be safe, I’ll definitely check with the doctor. Not sure what to do though, hoping you all have some advice!