NewMumJoy, I'm in a growth spurt too! At 16.5 weeks my boobs are exploding (and itching and tingling, which is weird). Lots of uterine cramping and weird twinges and so forth. And my preggo insomnia has returned the last two nights. I was up and wide awake at 5am and couldn't get back to sleep. I think it's related to the growth spurt since everything has been really quiet for the last two weeks in terms of symptoms and I've been sleeping through the night without a problem. Now I'm up a lot more with cramping and general brain activity.
I'm excited though, since it's a sign that things are still happening. It was so quiet here in terms of symptoms that I was starting to worry. But now it really seems like the little dude/dudette is growing madly. I can't wait to feel movement though.