Was I Wrong or Right to not correct her?

I was at the playground yesterday and we ran into another family from my daughter's school. The mom (who I don't know well but had met before) commented on how my daughter was so sweet to her youngest toddler and said "It looks like someone needs a sibling".. I am actually pregnant now but it is early and we are not telling people yet, so I said "oh I am sure it will happen, it's just sometimes easier said then done".. what I meant is that we have had a lot happen between the birth of my first (almost 6 years ago) and now.. moves, job changes, etc where it was not the right time to try.. I guess this mom took my statement to mean I had physical issues and she shared "I understand, I had a few miscarriages too..".. In the moment I felt it was an awkward conversation to be having with someone who is mostly a stranger to me, and I didn't correct or confirm what she was saying, I just said I was sorry to hear that.. and then the kids distracted us and the topic was dropped. I have never had a miscarriage and feel guilty if I wrongly implied her and I had that in common.. I also didn't ask her to disclose that info or ask her personal family planning questions.. what do you think?