Hi,

You can get heartburn at any time but it mainly starts and gets bad the heavier pregnant you get as the uterus is pushing up and squashing your stomach.

Ways to avoid it are stay upright for awhile after you eat. If you get it at night prop yourself up with more pillows so you are at a higher angle. Chew Rennie/Quikese tablets. Drink Mylanta or Gaviscon. Try not to eat the foods that set you off.