Jeez, when my SIL was pregnant and I was trying to conceive, I put my feelings to one side and shouted it from the rooftops. I was chuffed to bits.I'm pretty sure not so long ago they were out with her brother and his wife and the picture posted defo looked like her sister in law was pregnant but it was never mentioned. I know this could be triggering for her not being able to have kids, been there myself, but she could have said something.