What would you do?!

So my "friend" told me she wanted a baby and her hisband didn't. So one day she took the condom after he came in it and put it in herself. Well she got pregnant and is happy as can be. Should I even bother telling the husband. I feel it's not my business so I should just leave it alone. Am I right? 
I have no right telling him. I just plan on telling her to not contact me anymore as what she did is EXTREMELY WRONG.