No sperm count

My husband got a vasectomy in end of October. Last week he brought in his first sample, well past the time required to wait. However only had 6 ejaculations instead of the recommended 20. With the holidays and each of us being sick separate weeks we just didn’t have time. He got the result back and it said no sperm detected! Woo hoo! Anyone have it that early on as well!? We will still wait till after his second check in to eliminate protection obviously