Is this normal for your second pregnancy?

Is it normal to be in so much pain at 28 wks (with one baby) that you can hardly walk at times. My lower back, pelvis & abs just ache that I could just cry. I brought it up to my Dr at my last 2 OB-GYN appts, and she said it was normal becuz it was my 2nd pregnancy, but it wasn't this bad. The last 2-3wks its just gotten way worse, when I walk my pelvis & lower back will click. I have a Dr appt coming up next wk again, and I plan on brining it up again, but I just had to ask someone cuz its aweful & becuz my first pregnancy went so smoothly. Thank you so much for you advice/opinion.