:/
I am sorry but your Pekin is a male. I can see his drake feather. You need to act immediately.
You either need to:
•Get 8 more duck *hens* at the same age or older, ready to breed soon
•Cull (get rid of or eat) one of them, after getting a couple friends for the leftover one.
If you don't remove one or get more hens, your drakes will fight and possibly hurt themselves, or you, in their hormonal time. Drakes are known to rape each other if there aren't enough hens.
The proper hen ration is 1 drake for every 3-6 hens, in the heavy class.
In medium ducks, 1 drake for every 4-6 hens
In small ducks, 1 drake for every 5-8 duck hens.
The smaller they are, the more active breeders they usually are.