33 weeks and heartburn sucks!

Tr
The past couple weeks I feel like Ive been getting heartburn all the time.. especially while Im sleeping and of course it wakes me up. I keep tums by my bed and with me all the time. It does help when i eat a couple but doesnt always last. Im trying to avoid heartburn "trigger" foods but it happens anyway! Less than 7 weeks to go for me! 
Anyway have any good tips for dealing with heartburn?