I'm 20 weeks and 1 day, yesterday I started feeling really weak on the legs more towards my thighs now today I can barely stand and or go up the stairs without being in massive pain; I try to sit down and or get up from the couch and it's like I went to the gym for the past week working on my legs, it's almost to painful to even sleep; I've put hot patches I've called the doctor I've been drinking enough liquids!!!! What could It be ??