Pre-Labor?

I think I've entered the pre-labor stage of this pregnancy characterized by a change in energy levels and more frequent, stronger Braxton Hicks contractions.  I wake up at least 4 times each night and each time, but stomach is rock hard so I know I'm having a contraction.  They aren't painful really, just a little uncomfortable and enough to wake me up.  It's enough for me to get up, use the restroom and walk back to bed to make me feel a little better. I am not experiencing any back pain associated with these at all yet. 

And my energy level has seriously taken a nose dive. Some women get that sudden, crazy need to clean and nest but others get the utter and complete exhaustion.  Utter and complete exhaustion is what I have.  I literally could not keep my eyes open yesterday.  Thankfully I'm working from home this last week so I can conserve energy but it literally takes all I have to do my work via laptop.  I go to bed about 8:30pm or 9pm at night (after having a 6-7pm nap), but this is a different exhaustion than the first trimester exhaustion.  When E and I were shopping this weekend - only went to one store - I felt as if I might collapse under my own weight and needed to go home immediately to rest. After about 3 hours on the couch, I felt much better. 

There are a few other pre-labor symptoms such as loss of mucus plug and the bloody show that I have not experienced yet but I can't help but think this baby is on his way soon.