Well, its different for all of us depending on what part of the region your in, your weather conditions and when your rut is. If you know when your rut is, then fawns should be dropping roughly 6 1/2 months later (200 days). Some may drop later if they were not bred during the 1st rut cycle. Here in Ga they usually drop from May-July. The reason your not seeing them could be a number of reason. Wrong camera location, they are still too young to travel with mom, they didn't survive/haven't dropped, or the deer are not using your property this time of year. Deer patterns change with the season basically. Did/have you had pregnant does on cam?

good luck