Different scenario.. same questions!

Yesterday 14 dpo, took three hpt all positive. Like clearly positive. Not super strong lines but definitely there. This morning 15 dpo took another test, the line is there but lighter than the previous day. So here are my questions:

1) could this be a chemical?

2) should I keep testing daily or wait a few days?

3) do the darkness of the lines fluctuate?

Yesterday had very very mild cramping every now and then. Probably wouldn’t have noticed it if I wasn’t giddy about the positive test. Last night had more uncomfortable cramping. No spotting or bleeding. I normally have a 22-23 day cycle.