weight gain and pregnancy

I can't help but focus on the weight gain that comes along with pregnancy. It devastates me. It took a lot of hard work to lose 70lbs when I was 20 and dedication to keep it off throughout the years. I wish I could fully enjoy my pregnancy yet in the back of my mind, I fear not being able to get back down to a weight I am happy with. Between a challenging job, finishing my degree, and having a newborn - how am I going to have the time to focus on eating right and working out?! I know this is such a small problem when looking at the larger picture; however, I have always struggled with my weight.