Third Trimester Suggestions

Hi all, I'm slightly embarassed to admit I'm 26 weeks pregnant and haven't really been moving my body. I have felt so fatigues until recently when I found out I had low iron levels and now I feel myself having more energy I want to start working out again. I didn't have a great fitness routine pre pregnancy but I do have access to a gym with a pool. I go to pregnancy yoga once a week and I'm on my feet for most of my shift at work.

Has anyone got any prenatal program recommendations? Particularly that I could use at the gym that would be appropriate for this stage in pregnancy if I haven't already been following the program for 1st and 2nd trimesters?

Thanks in advance! I really want to gain/ keep some strength pre birth and postpartum