Confused

Bexx
My period was due last thurs never came. I took a test Friday it was a BFN.
Now my nipples are sore
I feel nauseous throughout the day
My stomach feels like it's doing flips 
When should I take another test? What if that one says no too.... Im confused as to what is going to happen am I eventually going to get my period or am I eventually going to see a positive test???!? Help!! Thanks :)