Workinmom's absolutely correct - you are NOT a bother to your doctor. You're going through one of the most traumatizing experiences to your body, and they expect you to call. In fact, it's better for their malpractice liability if you do call (even for minor) things as they can quickly develop into big ones.
They don't like to be bothered at 3am with a call wondering if you can take a tylenol for a headache. But, I've had to call on a few occasions with questions about things like Deep Vein Thrombosis (blood clots), and they were very responsive and attentive.
Even calling when I thought my water broke, they thought it was stress incontinence, and finally had me come to the hospital after being a 3rd time caller that day. Sure enough, my water had broken, and I hate to be induced for concerns of infection setting in.
I developed cancer while pregnant with my second child. My OB, because I was postpartum when I found it, was my first call, and he wasn't "concerned". I trusted my instincts and went to my Primary Care doctor. My OB was so worried about having missed it. I don't blame him. It's my body, he's a good OB, I had a healthy baby, and it wasn't a female related cancer.
Moral of the story: Call! It's OK, and the sooner they address even minor issues, the healthier you and your baby will be!