Ugh!!! What is going on with me!!!

Today was my scheduled start for af. Wasn't sure if this was my month. Been feeling nauseous, tired, lower back pains, etc. then this afternoon only when I wiped was a little brown so I thought for sure af came. Put on a pad and barely anything is sticking, only when I wipe its a little pink. And I have no lining or discharge when using the bathroom which is ver unusal for me! Ugh! I wish I knew what my body was telling me!