A. Being honest is one thing, but there's such a thing as too much detail. It's the same with the interview process. Since it's illegal for a prospective employer to even bring up the subject, there is no reason to explain about your fertility problems and possible pregnancy. Unless you model lingerie, there really isn't a valid reason to be concerned about a possible pregnancy. They have to accommodate you, and they have to have a comparable job for you after you return from leave.
Air travel is a no no during mid to late pregnancy.
A brand new employee would have fewer bargaining chips than one who has been there for a while. The honesty that is necessary here goes more along the lines of how do you feel when you're pregnant. If you have a good chance of becoming pregnant with more than one child, you may not to even want to work. If you're healthy and expect to have a normal pregnancy, you and your employer should just sit back and relax. These are issues to discuss with your doctor, not your interviewers.