Test line progression First Response

Hi!

I took a pregnancy test on 12dpo (going by the glow app) and got back a light positive on FRER. Took another one the following morning at 13 dpo that looked the same. The next afternoon at 14 dpo (day of expected period) I took the FRRR test and within the minute it was very light but after 20 mins or so it came back clearly positive. This morning I took another one and the line still looks the same to me! Clearly positive but hasn’t gotten to much darker if at all. Ive never taken pregnancy tests this early . I had a miscarriage in late February and didn’t test until 2 weeks after my period was due and all tests were very dark. Nervous this could be a chemical pregnancy. I’ll continue to test, I know no one can tell me for sure but if someone else has been in this same situation I’d love to know.