MomX, I haven’t seen you here before.
++1
Perfectly reasonable.
Artiste, I hope you do have that conversation Mom suggested. While it is certainly up to your son to decide how comfortable he is with the information you received, you are probably a better candidate for making inquiries with an ob/gyn. The likelihood your son has a relationship with one is slim. Ditto for the likelihood he”ll have the experience with these matters to know what / how to ask. When you have clear information it will be easier for both of you to work things out.
Wishing you much nachas from your son and, eventually, your daughter-in-law!