Infertility Testing During Engagement

Would it be okay for me to ask my bride-to-be to get tested for infertility before we're married? I can't understand the current trend toward "intentional childlessness" or the apparent devaluation of children in our culture – in fact, I've wanted kids for as long as I can remember! I also believe that marriage, sex, and children are all part of the same package (I'm sure your ministry agrees). Instead of choosing childlessness, I'm determined to be intentional about having kids. If I can't do this with my betrothed, I'm not sure I want to pursue marrying her. What do you think?