Excessive fatigue 31 weeks

This is my second pregnancy, I’m 31 weeks along, and the last couple weeks I’m so fatigued I feel like I can barely function. I’ve been getting good enough sleep... but some days I literally can’t hardly move off the couch without feeling my head almost spin from exhaustion. Nothing has come up with my urine or blood pressure at the last couple appointments... so I haven’t asked because I assumed it would if something was wrong. Should I ask about it at my next appointment? Or is this somewhat normal? I don’t remember feeling this exhausted at all my first pregnancy after the first trimester. I feel ridiculous and useless 😒 it makes me want to cry and like I’m failing my older daughter because mama can’t hardly function... 😞