<human>: I've had doubts during our time apart but have rationalised these as typical feelings for a long term relationship. This is my first future prospects relationship and I chalked this down to the ebbs and flows that come with that. Firstly is this normal?

Secondly, she's found out recently that her sister is unable to have children and will be getting a  test soon to see if the same is true for her. If it is she might have a chance if she tries sooner as her sister is a little older than her. We discussed the prospects of children before entering the distance and we agreed not for another 5 years. 

I don't know if I'm ready to have kids so soon, am I stringing her along by waiting till we are back together in a geographical sense to see if my doubts dissipate?

Can you summarize the given text in a few sentences?
<bot>: Having doubts in a long distance relationship and waiting till I'm living with my girlfriend to see whether  these will dissipate. Good or bad idea?