If you don't want to ask them, you can always check online for reviews, etc.
Congratulations on your weight loss! Don't be too sure about being unable to have children. Women
than you have done it - and I honestly believe, from what you've said, that you are not postmenopausal. Fortunately, you will be able to find out for sure from the gynecologist.
And a note: if, at any point, they are rude about your weight, they make you feel shamed about your weight, etc. - walk out.