Thoughts?

So before birth control my periods were never exactly regular. I've been off BC since October 18th. Last month glow predicted AF within a day of her showing up. This month, according to glow I should have started two days ago and I haven't. My boobs hurt and I'm eating everything in sight. Got a BFN yesterday, but two close friends said it's too early to tell. Ladies who've been pregnant before, can you give me your input? Thanks