Two week wait

So I took on of those cheapie blue dye 5days sooner tests this morning with FMU and got a BFN so I think I'm out for this month today would be 5 days before my missed period & im pretty sad considering I thought I had some implantation pain (sharp shooting quick pains at lower left abdomen) Saturday and Sunday. Any words of encouragement? Has this happened with any one else that went on the get a BFP?