Sayang, pelvic pressure at 27 weeks boleh normal, tapi since you're feeling something yang baru and worried, please message your doctor or go to your clinic ASAP , tak payah tunggu appointment next week okay? Better safe than sorry, especially for first baby. A few of us mums felt the same thing and turned out fine after check-up, but some needed closer monitoring, so doctor kena assess properly la. Don't worry too much now, just get it checked cepat-cepat so you can relax. You're doing the right thing being careful!