I hope your friend's in laws ain't that strict and conservative. If this is the case, then she can freely tell them about her hesitation in conceiving at the early moment. But if then if she is somewhat scared to approach, then I believe her husband should act as a communication medium between his parents. I trust things will execute the way she wants. Moreover I do not see any point of getting into a conflict, because your friend is just asking for a month's time and not an unending period! Tell her not to fear, and speak what her heart says. I believe both her husband and in laws will support her decision. She is ready to become a mom soon. But she needs a bit preparation that's it.