Possible chemical?

So I got a very faint line at 9dpo (didn’t get a pic) then from 10-13 dpo tests were light but showing a bit of progression. I was due for my period on 3/2 and I had some cramping and back pain that day so I suspected chemical, but AF did not show. I took a test this AM at 17 dpo and it doesn’t seem to be darkening. Could this be a chemical in the making?? I had a missed miscarriage back in November so I’m very nervous. Will post pics of my tests from 10-13 dpo and this AM.

1st pic is this AM

2nd pic is 10 dpo- 13 dpo