Sharp pain and pressure in pelvic area

Georgia
Hi ladies, I'm 36 weeks today and experiencing some pain.
Whenever I'm stood up or walking, I'm having a sharp/stitch like pain in my pelvic area, accompanied by a real heavy pressure. 
At my last midwife appointment, I was the told that our girl was almost engaged. 
Is this a normal thing for when the baby drops? Could it be a sign of labour? Is it something to call the mcu for? 
Ftm x