Pregnant!!! Should I be worried?

Desiree

I had a preterm labor 6 years ago, then I had a miscarriage last year in October. Im 13 dpo and I thought I would definitely get a dye stealer by now, but no. I'm scared of losing this one. I hope this isnt a chemical. Should I be worried?

Taken July 15, Not FMU

Taken July 16th FMU

Bottom pregnancy test taken July 17th. I think it may be faulty. (1st pregnancy test is the same on from July 16th)

This morning (July 19th)