12 weeks post-partum and NO weight loss!

Aiko • mommy of a 1 year old and pregnant with our second! Wellness Advocate for dōTERRA Essential Oils
How depressing!! It's been 12 weeks since I gave birth and I haven't lost a pound for months!! I lost a little right after giving birth but I've been at the same weight for at least 2 months now!! I work out everyday with ~30+mins of cardio (stair master and running) plus weight lifting! I was super active before and worked out throughout pregnancy
I'm so depressed and discouraged that NO WEIGHT is coming off. WHY not?!? 
I exclusively breastfeed and pump. Has this happened to anyone else? Wahh!!