Pregnancy Pillows-Is that Useful !! OR its a waste of money?

Hello Guys, I am suffering from back pain after my 20th week,cant walk and carry myself properly during early morning after bed, One of my friends suggested me to use pillows, have anyone tried pregnancy pillows? I never tried it during my last pregnancy, Kindly suggest.

I am using long body pillow. It is good and loved, it was perfect and easy to manipulate into the shape and position.