Sore breasts at 8dpo? too early to be af?

Aurora • Mommy to 1 beautiful girl, expecting # 2 :)
Hi! 
I've been having a little tenderness in my boobs especially when I run them it really hurts. & yesterday I had a 3 min. sharp pain in my stomach. 
Is it to early to be having tender breast as a AF sign? or is this all signs of period coming?
I also have light lotiony cm.
Please help!