I already decided on the diamond and the setting to go with it. But here''s the new dilemma! I wear a size 6 comfortably but now I''m pregnant and gained some 15lbs and still wearing my ring wich is 4mm width that feels snug but still comfortable. My new setting will be 2.5 mm that I will wear with a matching w-band 2.3 mm. My questions are... how to correctly measure your ring size? Should the ring spin around a little or snug? Should it be effortless when putting on and removing the ring? And how accurate are those plastic ring sizer?