I'm brand new to this site. I just finished week 3 of a Couch to 5k program and have been having pain since week 2 in my shins. It doesn't go away after the walking warm-up, and I can rub my shin and it hurts to the touch. Are these shin splints? A stress fracture? Has anyone else experienced this so early on? I wanted to run a 5k at the beginning of December and feel like I won't be able to now.