Side butt/hip pain

Jenna • We had our first baby girl September 21 2015 👑 she's our world! Now we're expecting baby number 2 in Sep!!
I'll be 40 weeks on Saturday and even now an then I get this pain on the side of my butt/ hip I can't wait and it makes me scared to move. And if I walking it almost take me to the ground. What could it be?? And what can I do to get ride of it?? 
I'm pretty sure baby girl is coming late and I don't wanna deal with this for week.