advice!! period/pregnancy.

So I started my period yesterday but before I started for the whole week I have had pregnancy symptoms. I smell everything, crazy bad nausea, super sore breast. Well my period has started and I still have nausea, sore breast and I can smell things really well. Anyone else still experience symptoms after AF should up. 
I think I may have had a chemical pregnancy
Also anyone still have or had AF show but was still pregnant?