How to not feel guilty

So I’m 8 months pregnant, I got pregnant on my second try, and I’m showing but can hide it. Besides I’ve always warn bigger clothes because who doesn’t want to be comfortable? But it’s been my choice to not necessarily flaunt it.

I randomly saw this girl I know yesterday and she congratulated me on my pregnancy because a friend of ours told her I was pregnant. Then she proceeded to tell me she was TTC, was having no luck at all, and her whole demeanor changed. We were in a setting where I had to be around her for awhile but I just feel like she put me in a really awkward situation. I wasn’t sure what was the right thing to say. I wasn’t sure how long she had been TTC for. So I just wished her luck. I know TTC is a very sensitive topic for some but what should I have said? What would you have wanted to hear? And how do I not feeling guilty in a situation like that? :/