Did somebody call me?

Belt drive - requires a specific frame, specific derailleur and hub gears. Less maintenance, but harder work if anything happens because of the specific parts. Great in Europe, annoying in Australia.

I have a bike that I love. (I have two!) My Fuji road bike has an adjustable head stem, so I can adjust the posture from a racing posture to more of a commuting or cruising posture. Great for pregnancy. But you do sit very high, so probably no good for you, and at the end of the day, it's a road bike.

Not all mountain bikes have that bum in the air stance. I had a Malvern Star hybrid which had cruiser posture, a nice wide bum saddle, and a low top tube, so a perfect skirt bike, and wide tyres to avoid tramtrack issues. I loved that one.

If you have someone who's handy with a wrench (or if you are) for maintenance purposes, you'll be able to pick up a cruiser pretty easily.

Failing that though, I think your bestest choice is the Cell Euro City Step Thru. Google it, I think you might love it. It's middle of the range, good quality for that price. Not too heavy and clunky, but still sturdy. Not tinny and going to fall apart on the first ride though.

PM me with any questions. Hope that helps.