Not that I want to argue the subject, but bucks will chase does in pre-rut too in expectation of the actual rut and that may explain some of the activity you are seeing. Some does do come in estrus early, but I can tell you with certainty, without giving away what I do for a living, that the vast majority of wild deer in the garden state come into heat in November, more specifically mid-november. Whitetails have a 200 day gestation period and being that the vast majority of fawns are born the end of May and beginning of June you will see, if you do the math, that most does get pregnant in the middle of November.