Hi, I had PGP during all three pgs, the last one ended with a mc at 10.5 weeks, but had already started having the telltale twinges... With DD1 I went to a physio, and was told that I had one hip weaker than the other which was putting pressure on my pelvis. I was given a support belt and leaflet of exercises, and sent on my way. The belt was some help, but the exercises didn't help at all. Between DD1 and DD2, I went to another physio in the same department (who felt I had a problem in my lower back, not my pelvis, despite what the other physio had said), but again, found it didn't help.
Late on in my pg with DD2, I went to see an osteopath. I felt like I'd been beaten with a steak hammer after the first session, then the next day we were in Tesco, and I suddenly realised I was happily walking round the shop, pushing a trolley, with no pain for the first time in weeks! I had sessions every couple of weeks up to the birth, then one postnatally, and it really helped me, though more as a short term solution.
I was thinking of seeing the osteopath during my last pg, then I found out I was going to mc. However, I am still getting pain (had to limp across the room holding my crotch this morning!!!) , so might go back and see her.
Our local hospital do a physio-led exercise class for back problems - it involves a lot of core work, so may actually help with pelvic pain. I gave up my place after a couple of weeks - I got onto the course just as I got pg with DD2, and felt really nervous starting a new exercise regime when pg. Maybe there is a similar thing near you? I did feel that PGP was seen more as a pregnancy issue though.
Not sure this will have helped, but I hope you can sort something out, as PGP is no fun. :(