28 weeks and back pain

Ugh I can’t stand this back pain. I work a full time job as a dental assistant I go in at 7:20am-5:00pm. After work I go home and cook than I’ll go to the gym at 8pm but I haven’t went because my back just been hurting and I know I need rest. What do you guys do for back pain? I also feel my baby low. Last appt i asked my dr what position was baby and she told me it’s hard to tell 😑. I feel like my baby is horizontal. Next visit I’m ask again.