Friend is pregnant and someone else revealed it on FB!

So my friend is 3 months pregnant but they're waiting for a doctors appointment before they announce it as they're worried there might be issues. She was told it would be impossible to get pregnant and was drinking throughout the three months not knowing she was pregnant. But they told a couple of close friends and one of them has written it on Facebook! His family have just seen it and are now upset that they weren't told. It's caused a whole host of problems.