Af gone an done with

Ok so AF came an gone everything was normal 4 days it's been 3 days since my last day. Today I've been cramping on my left lower area. After I eat I feel like throwing up (I don't) an some smells are making me sick I don't want to be the crazy girl peeing on a stick 3 days after my period. As I hate seeing BFN anyways!!! What should I do?