Sorry about your ducks 
 
I stuck to 8 for years and then last year I added 5 more pullets as my girls were getting older and then I got an incubator and hatched for the first time in November (got 8 boys out of 9 chicks 


) and then also added more 9 chicks this April (got one boy) plus let a broody hatch in July and I hatched quail in June 


 chicken math fully hit me LOL 
 
I kept the girl and 2 boys from the November hatch but sadly no longer have them as I had to put 2 down and one randomly died. 

 
Thankfully I have his chicks. Those are the ones I let the broody hatch. He died 2 weeks after they hatched. 
 
2 ended up being boys plus My April cockerel lol