26 weeks pelvic pain.

Iam 26 weeks and 3 days pregnant. Today i noticed more often then usual that im having pelvic pain low. My last ultrasound in october they said the baby was head first nestled in my pelvis and i dont know if he still is and if thats whats causing it? Im not very big naturally, its becoming uncomfortable to walk, roll over in bed and stand really. Should i be concerned? Is this, could it be an emergency? Just want to make sure everything is normal. I have an appoinment on he 29th and im wondering if it can wait to be talked to with my doctor until then. Thank you!