Eh, sayang, I know it's scary when you start feeling things down there, but please call your doctor or go to the clinic asap, better safe than sorry at 19 weeks, especially with the pain you're describing. Some of us pregnant mums do get pelvic pain and the milky discharge is normal, but the way you're describing it, the cramping, the pain when you move, the soreness on both sides, definitely needs a proper check-up to make sure everything's okay with baby and your ligaments. Don't wait, yeah? Ring your OB today or go to the nearest clinic/hospital if it gets worse. Take care of yourself, mama!