Aiyooo, sakit pinggang masa pregnant mmg common, but kalau sampai teruk sangat sampai sukar membengkok, better check with your doctor tau, kat 3 bulan ni ada banyak perubahan happening, and your doc boleh make sure everything is okay. A few of my mum friends had bad back pain early on and it turned out normal, tapi one of them needed physiotherapy, so it's really best to get it checked out so you tak worry lagi