I hope u have figured out if it was a gastric or a tummy ache. It is quite common for pregnant women to experience some heartburn sensation as baby v big and sometimes eat too full or too hungry plus baby pressing on stomach will cause a bit of reflux. I sometimes had that and figured it could be due to waking up late or just became more hungry so gastric. Whichever, have frequent small meals. I sometimes have supper or have a low GI food e.g. Sweet potato at night so that it can last me till morning. Try to see eht works for u :)
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