Will a high-protein diet get in the way of getting pregnant?

Generally it won't. But it's important to be healthy before becoming pregnant. So, if someone is on a high protein diet because she's overweight or obese, it may be best to become healthy prior to becoming pregnant. Diets for weight loss during pregnancy are discouraged.
No. High protein diets combined with complex carbohydrates, with moderate calories and exercise is an excellent start to attempting pregnancy.