[noodlez]

If there is an ingredient in your cream that sensitizes the tissues and receptors then xenoestrogens in the environment could cause change. Then again hormonal fluctuations through out your cycle will cause changes in the feeling of breasts. to be safe, do a breast exam every fifth day of your cycle lying down, shoulder raised (so breast tissue isn't hiding in the arm pit) this Is the ideal day to rule out hormonal fluctuations and is just good practice.
Very pleased to hear that you are taking care of your health and making better choices (: I'm trying to do the same.