Finished having kids?

How did you know you were done ? Was it just the amount you wanted or did you just know you didn't want any more ?
Fiancé says he only wants 2 (even tho before I fell pregnant this time he was cool with 3) and I don't know if I'm okay with that or not but I need to know asap because he wants a vacectomy when this baby is born (2nd baby) 
I know financially 2 would be best , owning/renting home would be easier to find and cheaper 
Could still have a sedan with 5 seats because I wouldn't have to worry about a kids friend staying over and all of us needing to be in car 
Can go back to work sooner
More money to spend and spoil them with 
But I don't know if I'd feel like our family is complete with 2 kids 
Any advice and expericnce would be greatly appreciated