Big booty

Is anyone else gaining weight in their thighs and butt? I don't have more than a bloat in my tummy, but I have gone from a size 1/2 to a 3/4 and maybe it's because before I was pregnant I had a lot more energy to work out. I still workout at least 3 times a week of cardio for 30-60 minutes and some simple ab and gluet routines. Just wondering if any of you other mama's experienced anything similar? I'm 11 weeks tomorrow =) gained roughly 5# but again not in my tummy region.