Hi, and welcome!! First off, good luck with TTC, I hope it happens quickly.
As far as HH as babybag, the ones I've had good luck with are:
Jinhee-the 4 outside pockets are
each big enough for a few diapers, pack of wipes or bottle, etc...plus it has lots of room on the inside. Two different ways to carry.
Corcovado-tons of pockets, and holds everything you could possibly need! It looks huge at first, but it really doesn't look as big in person...it's a great bag!
Havana-not as much organization as the others, but holds a lot and if you organize your baby items with pouches or something similar it works great, lightweight, easy to carry.
Sloane Crossbody-if you like handsfree, this one is a good option. My mom has two and it's an incredibly practical bag! Adjustable crossbody strap, lots of outside pockets for mama stuff (keys, phone, etc), and roomy inside. Also can be found quite cheap. I personally love the lamb leather, too.
Hmm...I know there are more, but these are the ones popping into my head right away.
HTH!