I don’t regard myself to be a fine tea connoisseur in any way. I’ll drink anything once, and if it is sweet (I mean Southern sweet) chances are I’ll drink it more than once.
That being said, I can taste the difference between “cheap” and “expensive” teas, and tea made in a paper cup versus in glass/ceramic/whatnot. I frequently try different brands of tea and my tastes do change over time.
I’m also currently pregnant, and if there is anything pregnant women are notorious for it is having bizarre tastes, though really the only change I’ve noticed is that all bleu cheese tastes sour to me. (^_^;;)
I do try all tea unsweetened first, but I am not afraid of sweeteners. Most of the time I use agave nectar, but will use honey (raw or processed), sugar, xylitol, stevia, or most anything relatively natural that I can get my hands on.