Braxton hicks maybe?

Courtney
Ok so I'm 17w 4d with my second, I never had Braxton hicks with my first but all day and even still now at 2 am, my lower belly has been tightening and there's so much pressure! it's not painful, just uncomfortable enough to keep me awake 😞 
Has anyone ever had them this early? Everything I've looked up/heard says they don't typically start until after at least 20w... 
I go to the dr in the morning, just looking for other info or advice before then?