Potty training before 2

Tay

So previous 2 kiddos I started potty training like the week they turned 2. We did the 3 day pant less method and they both did great. Currently our 3rd kiddo is showing lots of interest in the potty. It’s gotten to the point she wants her pull-up/diaper off as soon as it’s wet and we’re going thru them… she hides to poop and tells me she’s done/wants changed after. She is 19months and I’m due with another baby in 2 months. It would obviously be nice if she would be potty trained before the next sibling arrives but I also have been so busy lately and don’t think we are able to set 3 days aside (without leaving/appointments) and I’ve never potty trained a child this early. Just looking for advice or any other methods people have successfully done that worked? Or if anyone else had a little one under 2 potty trained? It’s just starting to get to be a lot of meltdowns with the constant need to change her bottom when her diaper barely has pee & the cost is definitely adding up going through diapers.