Hi. I was wondering how a person can tell if the band on their bra is too tight. I am currently wearing a 34 band, and am wondering if i should go up to a 36 band. Should there be red marks on your skin (from the band of the bra), after you take your bra off? I can't tell if my band is too tight or if is supposed to be a little tight. For reference, I am an A cup, and i weigh around 100-104 pounds. TIA.