Pelvic girdle ?

I have had some pains in my pelvic bone region on and off the last few weeks, but now as of the last few days it is pretty awful and sticks around all day. All of my joints in my hips, pelvis, upper thighs and lower back feel so stiff and and hurts to move and get up. I have done some online reading and saw this could be pelvic girdle paint or SPD. I have my 28 week appointment this Friday and plan to talk to the doctor about it at that point but hope my appointment does not get canceled. Anyone have this before ? Tips?