"He took up a lot of my partners time and wanted to touch his sibling all the time and it was very hard to deal with and I had to keep it all to myself because i didn’t think it was fair on them that I felt that way."
"She isn't your SC until you are married, btw. She's your BF's daughter. I'd also be concerned that your BF isn't present during his contact time. That makes you the unpaid childminder. He needs to step up a bit more, and he definitely needs to take paternity leave during your first couple of weeks. No way would I agree to mind his child while I have a new born. That is quite unreasonable."
Not even read the rest of the comments because comments like these just make me sad. A child from a broken home (and yes, it is a broken first family) needs to feel loved and wanted and PART OF THE FAMILY of BOTH families.
If you have these type of attitudes, then it's no wonder that there are so many kids and teens with difficult relationships with divorced parents/step parents. A child in this situation needs to feel like it has TWO homes and TWO families, where they are equally loved and at home and accepted in each.
Yes, I get that you will be a first time mum, OP, so it's different to everyone else with an 11 year old who has already been through it. BUT you are a first time mum with a step-child. And you need to take that on board. It's Thursday-Sat, just a few days a week. The rest of the week is plenty of time to find your feet as a first time mum. Plenty of second time mums with an older sibling in the house dont' get a break from the older sibling for YEARS. Literally years. And most of the time, the first child is still a toddler/jpre-schooler needing proper looking after constantly.
Look, the situation is that the man you love has a past family. They come WITH him, whether you like it or not. You have to maintain a good relationship with his ex-wife as she will be in your life for years to come. You have to treat your step-child as a member of your own family, it's a simple as that.
I think it would be fair to ask for, say, the first day/night back from the hospital without your step child there if it falls on a night when she'd be there, as that's what plenty of second time mums do - first child goes to grandparents for a day & night often during the birth/first day after.
I think it will be good for you all bonding as your own family for her to be there, honestly.