It sounds like she is able to control her peeing which might be a sign she’s ready! I knew my son was ready bc he would go #2 in his diaper and hated the feeling of being dirty and wanted us to change him right away. We followed the “Potty Training in 3 Days” book by Brandi Brucks ($6 on Amazon) and my son was potty trained in less than a week. Within a week and a half he was telling me when he needed to use the potty and he has had very few accidents. Best of luck!
We potty trained at 18m and he was staying dry at naps and overnight, interested in the potty, and telling us when he pooped. He also has good vocabulary and using 2-4 word phrases. We used the Lovevery potty training guide and they recommend making sure it’s at least 6 weeks away from any big life changes ie new baby. I’d probably say it’s too close? You could try but run the risk they’d regress and you’d need to do it all over again anywho. Also, I’d say at this age it’s not really any less involved than diapers. We have to prompt him every 1.5 hours to pee and he’s not able to take his pants off himself. May be super hard postpartum if your little can’t independently put their pants on and off!
It took 5 days naked at home and I’d say close to a month before he was only having 1-2 accidents a week
Go for it. We did the train in three days program from little big feelings and modified to our needs and situation (we skipped naked and went straight to underwear) lean into the cues she's giving you and go for it. You have a great window now that will make things easier. But I would prepare yourself for potty regression potential when baby is born. It's something they can control and quickly gets all your focus on them. We started with a little potty and quickly moved to the toilet seats that have built in kid seats in the lid and just provided a stool for reach. Good luck but I think her willingness and awareness is on your side