Is this your first pregnancy? If so, yes, it takes time for dilatation to progress. There is no need to worry about it. Your obstetrician will monitor how the baby's head will begin to descend and convey you the same. Contractions begin to cause pain towards the end of pregnancy. They may or may not be true labor pains. Please keep check over baby movements, any vaginal discharge
Regarding your burning pain, I feel it is mostly resulting from heartburn
, acid reflux
due to pressure on and displacement of stomach. You need an antacid
preparation and Ranitidine
These are the preparatory phases for delivery and please visit your obstetrician at the earliest.