MMC is so cruel, the sense of disbelief that’s it’s happened AGAIN with no sign is impossible to understand if you haven’t gone through it. I feel for you so much. When I had my second MMC I didn’t even cry when they told us. We were at the RMC and had had two good scans so were feeling pretty optimistic and when she did the “I’m so sorry Anne...” I think I said an undignified “oh for fucks sake, not again! Right, can you please book me in asap”. She forgave my language and was relieved I hadn’t fallen apart on her, they’re the loveliest people. It fucking sucks.
As others have said, tests may show an easily fixable issue with staying pregnant. The stage yours have happened could definitely indicate a clotting disorder which is stopping your placentas from developing as they should.
I don’t know how you feel, probably hugely battered, fearful, pained and sad, but while I hated the pointless feeling of trying again anticipating more losses, each one made me long for a take home baby more. We didn’t give up, DH having kids already didn’t make him less desperate for one with me, we were lucky to be in the same place mentally about it.
At the time we were having loss after loss I didn’t stop to think about how he really felt about what I was going through, I was understandably wrapped up in my own pain and the physical experiences. We talked a lot, always have, but it was only when we had a bit of an unplanned break as it took nearly a year to conceive again that we talked about how hard he’d found it watching me go through them. He wasn’t making it about him, but with one of mine he genuinely thought I might die and was pretty traumatised by having seen me in so much pain and it took ages for him to be able to share all of that.
6 weeks is early days, you’re still healing and your head will be a mess. It’s not great that he’s been sitting on his decision and it’s something else upsetting you’re now having to deal with. But I don’t think it means he won’t change his mind.
If he does, you might benefit from counselling to have a safe space for you to talk about what you’ve been through together. If he doesn’t, you’ll be at a crossroads and have some serious thinking of your own to do. It might be that even though you were ambivalent before, the experience of being pregnant 3 times means you know the joy and hope of expecting a baby and decide you really want to be a mum. That’s as much about you as it is about you wanting children with him. You need to give that some thought but there’s no great rush.
I really would call off the wedding. There’s too much else going on. So many people later regret going ahead with something so significant for fear of letting other people down. Yes they missed out on Italy and that’s crap, yes you’ll have paid deposits and it might be a lovely day, but no you don’t have to marry someone who’s changed the course of your whole life and ripped away a big part of your hopes and dreams, without even discussing it for a month and a half. It’s a party for your guests, it’s your life.