Could this be a chemical pregnancy?

I got an extremely faint line yesterday at 12dpo and today at 13dpo the line was more obvious but I’ve also started my period right on time?? I took 2 more tests after my first one just as a confirmation this is when I noticed I was bleeding… the seconds tests are negative.. unless my urine is diluted or the hcg isn’t built up enough I don’t know why I got one pos then two negs and a period. Really got my hopes up thinking this was my rainbow baby

(Top test is dry now but was positive in time frame)

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