26 weeks pregnant constant stomach and low back pain?

I am 26 weeks pregnant and for about maybe the last 6 or So weeks I have stomach pain that Seems to be getting worse all the time. I have it sometimes under my ribs which feels more like pressure and but mostly in the groin area. It hurts so bad sometimes even getting out of bed or standing up from sitting down is extremely painful. I am starting to have trouble sleeping now no matter which way I lay it hurts. Could this be round ligament pain? I remember having it with my son but not until I was closer to being due. Now as far as my back goes it has hurt since I was only a couple months just getting worse. It is mostly one spot on my lower right back that hurts more then I can explain. Sometimes if I am standing in the same spot for even just a couple minutes when I got to walk I almost can't. Like like whole right leg gives out and have almost fallen a couple times from this. The Dr knows about my back it was the same way with my son just tells me to take tylenol And apply heat. Well that never works. I don't know what else to do it Isgetting to the point where it is affecting my everyday life and harder and harder to play with my son as much as I used to. I go to the Dr Thursday but does anyone else have this same problem or experience it also? How do you deal with it? Could this be a problem with me or my baby? A sign of early labor?