sciatic nerve pain?

sa

29 weeks pregnant with my third baby. i have had the worsttttt back pain i’ve ever had. i can barely walk, i can’t stand for long periods of time, i can’t sit still for too long, can’t get on the floor w the kids (im a teacher), etc. i can’t do much with my left leg. cant even lift it to put my pants on. it’s a pulling pain in my lower left back. in my butt cheek kinda but more my tailbone. when i get off work it’s the worst. i can’t even speak too loud or it starts aching. is this normal? it’s getting worse as i get farther along but i have never felt like this is any of my other pregnancies. even sitting here typing this right now my back is aching. 😣