Babies on the brain...too much

The wedding isn't even until next summer and my fiance is already talking kids. She's two years older than I am and is freaking out that if we don't start trying for kids right away, she'll be over 30 when we have our first one. Her sister had trouble getting pregnant and ending up seeking out fertility services in Grand Rapids and I think that's what she's so worried about. I'm all for kids, but I was just hoping to be married for awhile and travel a bit before we really settle down to a family. I know infertility can be hereditary, but I wish she would just relax and stop researching fertility services in Grand Rapids when she should be researching honeymoon spots.