I had this during my first pregnancy, avoid any single leg exercises as they destabilise you and I found that they worsened my PGP. As Jess said, see a physio to rule out any pelvic floor issues. My physio taught me how to brace my pelvic floor properly when lifting weights which helped with the pain massively xx
I would ask your midwife and possible see about being referred to physio. I had pgp from week 18 during pregnancy, I found yoga helpful and had some exercises from my physio which I did which helped too. My pain was at the back, by I think 28 weeks I had to completely alter my routine for legs as I could no longer use a leg press without it causing more pain the next day Physio always said to me as long as it didn’t aggravate I could keep working out x