Ooh heartburn in early pregnancy is so annoying, kan! A few of us moms swear by eating smaller meals throughout the day and avoiding spicy or acidic stuff, I tried cutting down on coffee and tomato-based foods masa pregnant, and it really helped. Also try sleeping with your head elevated, and drink plenty of water lah, but best check with your doctor or midwife especially since you're still early, because sometimes they might suggest something safe like antacids if it gets really bad.