In my experience, when a doctor talks about diet and exercise, or the size of your abdomen, it's a good sign that he or she thinks you need to lose weight. She may not have talked to you about your diet because she's not a dietician, bariatric specialist or endocrinologist.
Some things you might want to ask yourself; are you pear-shaped and heavy through the hips as well? This could be a sign of diabetic syndrome which is a precursor of diabetes. When was your last blood glucose test? Do you have high cholesterol levels? How much exercise do you get? What is your BMI? Last, and most important, are you happy with your weight? Does your weight cause you to be self-conscious?
Weight loss doesn't have to be a big deal, in fact the basics are pretty simple. Eat less and move more. I know that sounds condescending but as one who has been there, it really does work. I practice strict portion control, never put food in my mouth after 8 PM, I don't buy snack foods and I walk 1.5 miles every day. I reduced my weight slowly and set reasonable goals. I rewarded myself with non-food items like a French manicure and a drawer full of sexy new panties in a smaller size.
Because of my medical condition, weight is very important. One of the transplant centers where I am being evaluated won't even interview patients if their BMI is over 38 because the likelihood of a successful outcome is so decreased. I recently lost 10 pounds in less than 2 months. When I say lost, I mean just that, I wasn't trying to lose weight and I have no idea where it went! My doctor spoke to me quite firmly about that.
If you are happy with your weight and appearance, and your weight is not causing health problems, that's fine. On the other hand, if it is causing problems, you might want to schedule an appointment with a PCP for a complete physical, blood work, and guidance on sensible weight loss.