My husband (28) of a year and I (27) have twin girls on the way, I'm 33+6 today, and I feel like I'm about to fall apart. His ex has got in contact with his mum, and told us that they have a daughter together, the daughter is nearly four - there is no overlap between relationships (they broke up before she knew, and she never said anything). They broke up due to both moving away from their uni city, and never had much reason to be in contact.
This news came to us a few days ago and we're both completely in shock. Despite what he says, I'm worried about him being there for me when the twins come, because of this new aspect. His ex is moving to our town for work and actively wants him (and I) to be involved in his daughter's life, and is pushing for us to meet her this week. I'm excited for him, and us as a family, but I also feel completely overwhelmed by fear and anxiety. This pregnancy has been horrific for me, and I felt like I was coming out of the woods in terms of my anxiety, when this happened. I don't know how to be a step mum, I'm not even a mum yet.
Where do I go from here? Obviously this changes nothing between me and my husband, but I don’t know how to support him through this, how to not be too full on, I don’t know if this means that we have to get everything for a young child as well as twins, who could be here in anything from a few days to a couple of weeks. Where do I turn from here? How do I make sure I don't step on his ex's toes, while also being active in this new relationship that my husband needs to navigate?