I've had some serious issues with constipation the past 24 hours, and have noticed that even after relieving myself, I still feel tons of pelvic pressure. I also feel like I have a pulled muscle on the left side, near my hip bone. There is no cramping, or bleeding, and the pain is significantly less bad when I'm laying down. It's excruciating when I go to stand up, and I can barely push on my lower tummy. I'm 12 weeks along. I am almost positive this is either trapped gas or more constipation. Anyone?