I had it with DS, it was horrible!!
I was told by a Dr it will help to give birth on your side. That was the last thing on my mind while in labour & I gave birth on my back, I dont think I had an extra pain in that area whilst in labour/giving birth (felt pretty much the same as when I had DD)

It hung around after giving birth, I couldn't lay flat for 7 weeks post birth! (I had to sleep sitting up for about the last 2 months of PG) Mine started at about 4 months PG & got alot worse over the months.

I have heard it gets worse with each pregnancy... thats not from experience though, just what I've been told.

Sorry I cant give you anything more positive. Thank goodness you dont have long left.

Try not to walk too much