Severe heartburn in 14th week

Sw • Fri, May 20

After having dinner I took calicuim tablet and slept and I woke up for toilet I felt severe heartburn had this for first time burning sensation in stomach n chest and bare the pain. Drinking plenty of water Can't help don't know what to do. I'm tensed how to get rid of this? 😫 having buttermilk pain little relief 😣 is this normal?