She has messaged his family, his mother his aunts brother. She definitely wants him back and is doing all she can to 'get in' on his family telling them before he even had the chance to process anything I would even go as far as to say playing the victim
Well she is a victim, one of several.
She did nothing wrong. She was single dating a single man and she used contraception. Then when she discovered she was pregnant, he dumped her and her family disowned her. Of course she was desperate - was pregnant in a pandemic with no family support. I’m glad to hear that they have now reconciled.
What she has and will go through doesn't take away from your pain of course OP. You are both victims of his major fuck up, as are your two children and his unborn child.
Have you talked to him about how it might work if you stay togthee @Namechangeforthisone83?
Obviously he will need spend time with her at her home, after baby is here. I believe little and often is recommended for babies - so perhaps and hour or so 4-5 times a week.
Then time at his / your house as baby gets older, working up to overnights when child is a toddler.
What about child support ? Do you have spare bedroom or will they have to share with your children?
Once child is older, is your husband going part time to care for his child when they are at your / his home ? Or can he rearrange his work into compressed hours ?
How will that impact on you and your children ?
How will they cope with their half sibling living with them half the week ?
I know you don’t want to think about all this right now. But you need to, so you can make an informed decision about what life will be like if you stay with him.