I hear you. I think wanting to have a safe and successful pregnancy, whether through traditional, or IVF or other fertility assistance is a great reason to start back on the jouney to health.
I think what ever motivates someone - as long as it is the real reason for motivation and it's centered on yourself, is a good enough reason. I think it starts to be problematic when we start looking at losing weight just to please others. That I think is setting ourselves up for failure.
You're on the right track in my opinion.
Hayley