Mariah hit Mexico for a mini vacay this weekend.  And pics of their south of the border romp are sparking rumors of a pregnancy.  Mariah and Nick have been very vocal about wanting to get pregnant soon.  And sources at their resort say MiMi abstained from alcohol the whole trip.  Now we know that's unusual.

She also seemed to be holding her tummy a lot and wore much more covered up clothes than her usual.