BFP but now faint/neg?

Alyssa

I am so confused! These were taken a day apart. First two lines were approximately 7-8dpo and the last one was the following day. I have been having bad cramps (the same I had with my son). With him I quit testing because I did not get strong positives till 4-5 weeks. If it is a chemical when will I start bleeding? Still no period.