New to lap swimming & pregnant

I know how to swim casually but want to get into lap swimming as there’s an indoor pool nearby and for my particular body my doctor agrees this would be my ideal form of exercise through the rest of the pregnancy (18 weeks along now).

Have a few questions about my plan: -purchased a sport swimsuit, goggles, and a snug fitting swim cap -plan to do a private lesson to go over form and familiarize myself with etiquette -don’t expect to be able to swim very fast, might do a 20 minute session then take a 20 minute break to the side and go again as I’m health wise on a more gentle exercise plan through delivery -want to go during slow times so I can avoid sharing lanes. Mainly over concerns about someone accidentally running into me or me into them as I’m learning and landing a flailing limb to my belly that could hurt the baby.

Any recommendations and illuminating of etiquette I might be missing is welcome!