No.

I saw a research on deer calls and from that research it was stated that there is no scientific research that deer make an "estrous bleat" that it is nothing more than a contact call. I do see on a particular website of deer calls that they have the contact call and estrous bleat has two seperate calls but are very similiar in sound.

So either way, it is not too early because the "Can" doesn't mimic the sound to perfection so you may be making nothing more than a contact call and this call is used throughout the deers yearly life.

There has been posts already that have had success with said call and I personally mimic the "can"/contact call on my Deer Flute by River Valley with success as well.