We are on our first clutch also, and a few of our eggs started to slightly dimple after about day 32 ish (i think). We added a little more water to the substrate and it seemed to slow down the dimpling, but not stop it. We are on day 48 now (they are really dimpling in now) and they are all still doing fine! You can't go wrong asking this here... this site is great, they all have helpful advice, and seem really eager to help us newbs!
Good luck with the clutch!!