Don't be so sure that 佢哋一定幫我, at best they may just help the 孫, not you, although it's not your fault.
My husband also had an affair with a girl 2 years ago. My 9962 also pretended to help me :;pppp: , but in fact they just helped their son, not me.
If I were you, take good care of yourself & BB. Prepare 2 plans, one is if he wants to come back later, can you forgive him?
The other plan is if he decides to leave, what would you do? Prepare options/back-up plan for yourself & BB. No matter which plan you will use, try to get as much money from him as possible because you have BB now.
Just stay here, and wait for the coming of your baby.
Now, you can send a SMS to him, and tell him that if he don't come back (and stop the relationship with that girl) before the deadline (the day you go to hospital), you won't write down his name (father's name) in your baby's id. Your baby will follow your family name ............ :;pppp: