My buddy and I brewed our first all grain kit about 2 weeks ago. It is a Tallgrass Velvet Rooster. I transfered to secondary today and noticed that I only have about 4.5 gallons (or maybe a bit less than that). My hydrometer readings look normal, I was just shocked at the low amount. I would have added some water to primary if I would have noticed on brew day. What kind of effect will this have on my brew?