Had similar issues at around this part of the pregnancy before the aching is focused on my lower waist at week 35 till due date. And it should be normal, best to check with your OB/GYN when unsure.
Aching is, unfortunately, normal to experience while pregnant due to all the pressure. You could try light stretching to relieve tension in the back muscles. Or get your spouse to massage your back
Yes normal, mine hurt terribly as I have hurt my spine before. I use heat patches like the ones from Blood to soothe the ache temporarily.
Yes it is normal. Prenatal massage will definitely help in this
yes normal