I have gained about 10lbs and I haven’t been doing anything different. I eat healthy and walk 2 miles a day. My PCP did change me to a birth control pill. Could that be causing weight gain? Or and I on a stall?

Stalls are plateaus but they don't make you gain weight. Over what period have time have you gained this weight? If it's over a month, that's concerning, if it's over a year it's just excess calories. I searched online about weight gain and birth control pills and read:

Weight gain is a common birth control pill side effect. Certain oral contraceptives are more likely than others to increase the pounds. Fortunately, the weight gain is often due to temporary water retention and will go away in a few months.

Water retention is a typical symptom of premenstrual syndrome that is caused by fluctuating hormone levels. You’ve probably noticed it before—about a week or two before your period starts you start to feel bloated and your clothes are a little too tight.

Estrogen-containing birth control pills have the same effect. The most widely used type of birth control pill contains two types of synthetic female hormones—estrogen and progestin—that prevent your body from releasing an egg. It is the estrogen part of the pill that can cause you to retain water, which may make you feel like you’ve gained weight. Water retention usually passes after you’ve been taking the pill for a few months.

Thank you so much!

While it could be the pill, I would also try tracking your food in MyFitnessPal or something similar, just to see how many calories you are really eating. It's really easy to have "calorie creep" and eat more if you are not weighing or measuring your food.

I hope you find an answer soon!