Heartburn in pregnany.. help?

i have had heartburn thoughtout my pregnancy then about 1 month ago i had heartburn that bad nothing would work other than gaviscon and ice cubes i saw my mf last week where out the blue i was 3/5 engaged and she said if i make my due date.. now i have no heartburn and not needing to take anythink.. im 33 weeks today.. i was wondering weather that is a sign that labour cud start at anytime past few days felt braxton hicks in groin to.. thanx