Pregnancy workout schedule

I am currently 16 weeks into my 2nd pregnancy and i'm looking to get the most benefit out of my workout routine. In my first pregnancy I wasn't fit at all and didnt turn into a fitness nut until post partum lol. It seems like i'm already growing at a faster rate this time around so here is my rotation:

Monday - Tracy Anderson Pregnancy Project
Tuesday - Summer Sanders Prenatal
Wednesday - Element Prenatal Yoga
Thursday - 10 Minute Solution Prenatal Pilates
Friday - ???

The reason there is no cardio is because I take walks daily with my 2 year old while its currently warm outside. I know in the winter I may start subbing in Walk Away The Pounds. My question is do I repeat Tracy Anderson 2x a week since its a month to month workout or should I include more yoga and pilates? I've read so many posts saying different things because i'm torn. Any help would be appreciated or any experience you've had that helped more.