I never had heart burn before pregnancy now im 3 months post partum and i get it often. is that normal?

Heartburn is not unusal ever. The most common things that affect it are whether you have a hiatal hernia, what you eat, when you eat and whether you lay down after you eat. So you need to have a physician test to see if you have a hiatal hernia. Eat smaller meals with less fat content, less chocolate, less coffee and less mints. Do not eat in the evening and do not lay down after you eat.