Positive digital then negative

Natasha

Hi, I am just wanting to share my experience and any advice. Fours days ago (5days before my period was due) I got a faint positive on a cheap test. I tested early as my nipples were very painful! I bought a clear blue digital and it said positive 1-2 weeks, tested again the next day, still said 1-2weeks. I then did another digital yesterday morning, as I was using the cheap tests inbetween to make sure my lines were progressing, but they didn’t seem to be darkening, and unfortunately the digital test said not pregnant. I am still getting faint lines on the cheap tests and have had no bleeding so far (period is due tomorrow). I am thinking it’s a chemical pregnancy but would that show on a clear blue digital? I