My MIL will never ever know. She has been asking for babies for 5 years. We are totally abnormal according to her, I'm the only person in the family over the age of 30 who doesn't have a 10 year old. She made some horrible comments about people who need fertility treatments so she will never know how our kids were conceived.
I will never understand why people are so opinionated and rude about this. Just because you had it easy doesn't mean that everyone does. It's so personal and awful and you have no idea what the person on the other side of the table is going through. I'm sorry she's so unsupportive.
I think a lot if it is that her kids were surprise pregnancies at 18 and then 6 weeks after my DH was born. So I think she's jealous of people who want and plan for kids because she never had that chance.
My mom, dad & sisters all know. One of my other sisters is TTC as well and just texted me the other day to ask if I was pregnant and say she's not yet.
FIL/MIL/SIL don't know. H and his family aren't close talk to each other every week or even every month kind of people so it's different. They all love each other. They're just very individualistic about how they approach their lives.
My Mom doesn't know. She had really terrible morning sickness and has told me several times that I need to time my pregnancies so I am not working for the first couple months (I am a teacher, so she seems to think I could time is exactly for getting pregnant the last day of school or something. Doesn't really work like that! Though I guess it did for her). She also thinks we should start trying next year for some reason (I'm 31 and we want two kids). I honestly think she is enjoying being an empty nester and isn't quite ready to give it up. I'll tell her right away if I get a BFP, since she'll be thrilled and awesome about it once it is a forgone conclusion.
I would never in a million years tell my MIL. She is overbearing enough as it is. She also has the world's biggest mouth. She posted on facebook about her MIL passing away before she got in touch with my FIL at work to tell him about the death of his OWN MOTHER. Fortunately he didn't see the facebook post before she managed to tell him. It would only be a matter of time before she started posting stock photos of babies and tagging me in them and writing things like, "just can't wait to be a grandma! Not that I'm hinting at anything!" She is seriously that unsubtle.
I did vaguely mention to my sister that we are going to start trying, but I didn't really make it clear that we are full on trying right now.