surprise in the animal trailer

i went to give water to my rabbits and my gray rabbit had plucked a fur pile again. she still had her first set of babies with her. i noticed the fur pile was breathing up and down. i slightly moved the pile apart and my gray rabbit gave birth again. put her other babies in their new home cage. the black rabbit is the daddy. my brown and white rabbit should be having birth soon with in 2 weeks if my calculations are right..