Heeellppp! Pelvic Girdle Pain?

Shelby
27 weeks here. For the last about 2 weeks I have gotten an extremely sharp stabbing pain in my left butt cheek, deep inside. I initially thought it was sciatica issues but hours of reading has me pretty convinced it's PGP. I am a cattle farmer so am very very active. I'm currently about 145lbs, only gained about 6 lbs so far. So shouldn't be weight related. 
Nothing I seem to do to help alleviate the pain is helping. Tylenol, warm baths, limited activity vs lots of activity, stretching (just tried that and holy moly it felt worse) 
Should I seek physio therapy? A few articles I've come across say that may benificial. Any first hand experience would be so greatly appreciated!!!