My announcement hurt someone i love!

Today I suprised my side of the family by announcing my pregnancy during a family photoshoot. Unbeknownstto me and the rest of my immediate family my brother and sister-in- law recently had a miscarriage. Though it was kept secret from me by both of them I finally got it out of another family member. They have no idea that I know this information, I think they may be trying to spare my feelings. However now I feel awful to have caused them and especially her more pain. I can't really tell them how incredibly sorry I am for their loss as I am not supposed to know in the first place. But now i can't help but feel a bit guilty because I was the cause of someone else's pain. The truth would have spilled sooner or later but now i feel so bad doing it in such a grand gesture kind of way. I don't know if I am looking for advice for how to proceed with this especially with the holidays coming up. Or if I just need some kind words. But either would be appreciated at this point.