Cravings before 8 full weeks?!

Amber • Me and my boyfriend are super excited to be having our first baby! Our due date is 11/11/16 as of right now. We are teen parents as I am 17 and he is 18. Wish us luck!
I'm 7 weeks and 5 days today. I've been drooling over pickles and even more over pickle juice. Is it just me or has my cravings came early?? Aren't they supposed to start at 12 weeks or so?? Thanks!!