Water is great. Exercise is super. And by the way, I'd start strength training this second. You are not gaining weight from that. It takes a good few months for women to gain muscle, and that's if it's done with real intensity. I'd weigh every day and not rely on measurements. Weighing every day is a great way to keep focused on learn your body. And most importantly, there's no way to stick your head in the sand. Yes, one does have to learn to deal with the fluctuations, but by weighing every day you get to see a trend and how they get to be.
All that's fine and dandy... but the biggest factor to weight loss is the food, the food, the food.
Most days I hit around 1500 cal,
Okay. Whatcha hitting the other days?
Steady, weight loss results, won't happen unless you have steady, consistent on plan days.
One day off, heck one meal off, can wipe out an entire weeks on plan efforts for sure.
I certainly have no way of knowing what those other days are looking like, for all I know they're less. But you left it open and it's the first place that needs to be looked at.
Also, are you certain that you're measuring correctly? Are you possibly accounting for 6 oz of chicken, when you've really eaten 7 oz? Are you counting each and every morsel, taste, lick, dollop, sip and crumb that's going into your mouth? Are you perhaps using 1 1/2 tablespoons of oil, when you think you're using 1? In other words, is there any way that you're underestimating your calories? It's real simple to do.
That aside, I'd give it some more time.
Oh and your baby is precious - congratulations!!!