I have have been taking Januvia for over a year and the pills are a round beige colored, but I just had the prescription refilled again and this time,I got some big oval white pills that are stamped 574 on one side and can't tell what is on the other side, a D or half moon, something that I can't figure out what it is, Maybe a logo? The prescription bottle says it is a generic Januvia. Does anyone know what this is?