Contractions pain

Hi mummies, iam currently 37 weeks 4 days and baby's current weight is 3.5kg, doctor suggested for a C-section as my body condition is such as well...my next appointment will be Nov 1 which is 39weeks by then but I have a doubt how to differentiate Braxton Hicks n Contractions pain though its not my firsf time being a mum but for both my kids I didn't get to feel pain or water bag broke because both due on time n size weight was as usual.... I have read many posts n googled much but it's very much confused #advicepls #pleasehelp