Dont worry about it. Turkeys brains are not that complex. You are fine, preseason calling is a great way to get better at calling in turkeys and lets you know where birds are. I dont buy in to the you will mess up your hunting if you make turkey sounds b4 season. There are some places, like on heavily hunted public areas where there could be some effect but a turkey isn't gonna reconize a specific yelp and say hey there is no hen with that yelp. I have had better success doing late season hunting that early season and that is after the "dumb" birds are gone and the others are "call shy". So good luck and let me know how you do.