I'm 31 weeks and have been experiencing super sore butt muscles for the last 4 days. I woke up one morning and it felt like I'd done squats in my sleep or something! Online research indicates I'm experiencing Piriformis-Deep Glute Muscle Pain, which for me effects the ligaments/muscles on both sides of my butt extending from upper center of lower back to lower outsides of my cheeks. It's definitely not sciatica (not shooting or only on one side), and it's not a tailbone pain either. Aread any of you experiencing literal pains in the butt?