29.3 weeks pregnant questions .. not getting answer from doctor

I have been having braxton hicks since around 10 weeks I'm not 29.3 anyhow. they are progressively more painful not unbearable at all but just come with pain and pain that foes to my back. I have mentioned these to my doctor and he basically was said keep drinking water. I drink over a gallon a day even when not pregnant I do not need more water. also they when I get them I feel pressure in my bottom. I have 2 other kids and dont remember this. anyone have similar experience. Thanks