Pelvis hurting terribly

Aileen • Mommy of 2. 2 previous MC.
So I am 31w and feel like baby dropped and is engaging. Last night it hurt so bad to sit, stand, walk. I seriously couldn't walk without feeling like the head was going to come out. I had these pains with my son when I was like 37w. Why are they so early?!? I don't think I can do this for 9 more weeks!!! :0