My mother-in-law announced the news of my pregnancy on her Facebook page, before I even told my closest friends. I am so angry with her. My husband says i should let it go. How should I handle this?

Maybe she's too excited, but thata not very respectful towards you also. I think to take it from here, just tell you hubby to convey the message to her that BOTH OF YOU don't like it that the news was annouce without informing us, because you guys were actually planning for "something else" and ask her not to do anything like that next time.