Hi AJ

It sounds like SPD, whcih mean pelvic instability. I got it at 23 weeks and i just gets worse with time.
You'll need to go to physo, basically they will give you a support belt that you have to wear all day and maybe night ( it lifts the belly up a little, takingt the pressure of your pelvic area) and do exercises as many times a day as possiable.

It really helps. Since having the belt, I'm felling 75% better during the day, but comes night time when I take the belt off I feel the pain again, but its better then ever before.

I hope this helps, Good luck.