Terrible Leg Pain

I have had some awful leg pains lately. It is not a charlie horse but steady pain that is lasting for days. It starts at my mid-thigh and goes down to my ankle. It just feels like my leg muscles and knee ache really bad. Nothing I try works (warm bath, ice pack, heating pad, rubbing it, laying down, Tylenol). I am starting to think it is worse when I lay down. I was laying on the sofa tonight and when I got up, it was throbbing and almost a little numb. And last night it hurt really bad when I woke up to go to the bathroom and then in the morning.

Maybe it is just from the quickly-added pounds of the pregnancy (14 lbs in 15 weeks)? Could it have something to do with circulation from laying down? I was laying on my back tonight... At first I thought it was from over-exerting myself so I have been taking it easy and actually did nothing today but it feels better if I move it.

Sorry this is so long but I am getting really frustrated with this pain! Thank you in advance.