Did you know your cycle affects your voice depending on what pahse you are in?
Estrogen and progesterone cause fluctuations in hydration, thickness of your mucus and vocal fild swelling which lead to vocal changes - temporary ones.
After your period and into ovulation (follicular) your voice may feel more energetic and possibly higher. While during the luteal/premenstruum phase can feel fatigued and a lower vocal range.
Have you ever noticed this?