fiance has not told MIL that we are expecting

Maybe he wasn’t ready for people to know yet? It feels very different for a man and a woman but maybe he prefers to wait until 12 weeks or so, which is a valid thought, and technically you told your family without consulting him. (I do get why,as I couldn’t wait to tell my mum either) As for this being more your news than his? No, I don’t agree there. You need to have an open conversation with him about how he wants to handle telling people, and both give your thoughts on the situation

I was in the exact same situation, he felt a little like his parents would judge him and think he was just still coming to terms with it. He told his parents about 3 weeks after I told my dad. I told my mum when I found out at 5 weeks but didn’t tell my dad until a week later as I was still deciding what to do.
In the end his parents were thrilled and so supportive I just waited until he had processed it and was ready for all the questions.
We made the decision when to tell everyone else together and waited for the first scan.

It definitely isn’t more your news than his…it takes two people to make a baby and it’s a big deal for both of you. It sounds like it was a surprise given you weren’t sure if you were going to keep it, so he probably needs time to process and he may be worried about how she will take it as it’s a big thing. It’s his mum, so it’s down to him to share the news how he wants to, so long as he lets you know when he’s going to and doesn’t keep it a secret well into pregnancy, I don’t see the issue. There will be lots of decisions relating to your pregnancy that will be more yours than his as the pregnant one, but this isn’t one of them, and just as it wasn’t his to dictate whether you told your family or how, it’s not for you to dictate to him either. I’d give him some grace on this one, and your mum should too. Once it’s been 12 weeks if he hasn’t shared, then you can highlight you want to share more widely and realistically his family would be upset if they didn’t hear first.

In my opinion, and because my family knows but my partners doesn’t (besides 2 people) yet and I’m at 10 weeks, maybe he’s waiting for the end of the first trimester because it’s safer?
Everyone has their own pace at which they want to open up and share these big life events. Maybe he wants to wait for the risk to be over before he gets everyone on his side involved?
Since the baby doesn’t sound planned, it’s a huge bomb to drop on people.
When I told my family they didn’t know whether to cry and be upset or to be excited for us.
You need to let him go at his own pace, if you push him, he may just feel more pressure about this sudden situation. Let him tell on his own terms so he can share the news in the happy way he’ll want to

I think it needs to be a joint decision when to tell respective parties. For example, we went through IVF and we talked about being more open about it with my parents. He agreed. I was adamant about not looping in his family because his mom has a tendency to run her mouth about things that are none of her business. Aka we hear about my husbands sisters mental health breakdowns when I’m sure my SIL doesn’t want other people knowing. Stuff like that. So we decided together we would hold on telling his family. We decided we were comfortable opening up to our closest friends as well.

I agree that it’s not necessarily more one persons news than the other. You guys are getting married and it’s time you start thinking of yourselves as a unit, a team. If you wanted to open up to your family, I would have talked to your husband first about it so it could have been a conversation.