Certainly you can just enjoy your puppy. It is refreshing to hear someone considering the responsibility of breeding before the fact.
Arwen and Jenna were 4 years
Babs was almost 3 when she had the puppies.
I had on that had a litter at 2.
Definitely no problems with them being 3 or 4 years for a first litter. You do not want to go much farther than that, though, if you are going to breed.
Jenna, RN CGC & Babs, CD RA CGC HIC
Heidi, RA CGC
SG3 Odessa, SchH1, Kkl1, AD
Ninja, RN CGC & Milla, RN CGC
Joy, Star Puppy, RN CGC
Dolly CGC & Bear CGC