I don't think you're silly at all! If I had someone give me that accurate predictions I'd beleive them too (unfortunately it's not always that straight cut a prediction thing, and there are alot of people in the industry that have no actual skills). Remember that it's not an overly specific medium- and your idea of having 2 kids may not be the same as what pans out- there are lots of different ways you can end up with kids.

I'd love to have the same info to help keep me positive and motivated while TTC. It's a pretty draining time! Good Luck