Reevaluating [or finding] my motivation

I'm having a lot of trouble with my motivation to work out and stay in shape lately.  In the past, and I'm sure in the future (post-baby-birth in late April), I've been extremely motivated by the little number on my scale every morning.  It's one of the reasons I bought a high-priced scale.  The accuracy of that number could make or break my day....and also push me to work out  on days I might not be feeling it.

But now, my weight is going up regardless of what I do, so the numbers that normally light a fire within me aren't there.  I realize I'm growing a human being right now, and that requires a certain amount of additional calories, fluids and consequently, poundage.  But, it's hard to stay motivated to work out when I know the scale numbers are just going to go up regardless.  Also, as someone who enjoys "pushing herself," it's frustrating to workout when I am not allowed to do that.  I have to make sure my heart rate doesn't go too high, and my body isn't overstraining itself.  A big hunk of the fun is gone with these limitations.

My races are not motivating me either....Not even the fact that the "Goofy Challenge is ONE WEEK away!  I haven't been training properly, and I know, if I finish the marathon, it will be some sort of miraculous occurrence.  (Although that hasn't been preventing me from selecting my Disney-themed running attire!  Still motivated by race-day fashion. :))  I know there's a large contingent of runners who love running events regardless of their finish time.  But, I'm a very competitive person.  Not so much with other runners, but with myself.  I like to run an event because I like trying to beat my old PR, or get under a certain time.  I don't like running races knowing that I won't be able to push myself the way I want to.  I enjoy running regardless, but again, it's becoming frustrating when my body won't do what I'm accustomed to making it do.

Running outdoors is hard, because I'm more apprehensive about becoming dehydrated. (and I've needed a LOT of extra water during my normal workouts now.)  Also, my workout clothes are becoming more and more uncomfortable, so it's easier to either be on the bike in spin or on my treadmill where, if I need to make a wardrobe adjustment (and/or a quick pit-stop....because I need to pee a lot more often too) I can pretty easily. 

As I mentioned, I have the Goofy Challenge coming up in eight days and I am not ready.  Usually when I say I'm not ready for a race, I mean I'm a few long runs short of confident.  But this time, I really mean it. I'm not ready....I can finish the half. The full the next day will be another story.  Not sure exactly what shape I'll be in....especially since, I plan on walking around Disney World all day Thursday and Friday, then racing on Saturday and Sunday....Sunday (& Monday) could both end up being quite brutal.  I'm obviously not going to be running the entirety of both races....more like a very slow run/walk combo.  I hope to finish both, but that might not be feasible. 

These are my last races before my bebe-induced race sabbatical.  I'm already excited about running post-bebe, and choosing a "comeback" race afterward!  But, in the meantime, I need some tips on how to stay motivated to keep working out. How do you keep yourself motivated?  And how do I keep myself going, even though I'm gaining pounds and inches? Any advice will be helpful!