I swear I feel it! have you had this?

Alyssa
I feel "off" until about noon. Like my breakfast is sitting higher in my stomach and just doesn't feel right.  My boobs don't hurt but they feel heavy.  When I run (in a sports bra) I feel like they aren't secure.  
I have negative tests but I'm still very early.  Af shows up on Monday (but hopefully she doesn't).
Has anyone had it where
You knew this early even though tests were negative?
You swore you were pregnant but you really weren't?