20 weeks Prego.

I work A full time job as orthodontics assistant. I been feeling so tried and not the mood of working out. I was going go to the gym today but my back was hurting a little and I been so sleepy. I hope to go to the gym tomorrow. How many days a week do you guys go to the gym while prego and working a full time job? With my son I worked out during my whole pregnancy but it was easy because I didn’t work. Right now I’m going 4 days a week and sometimes 5 days.