am I pregnant after 4w5d miscarriage?

I had a miscarriage Feb 19. I was 4w5d. I did not get AF this week and I am now 4 days late (if counting the day I started bleeding from my miscarriage as day 1 of my cycle). I've taken 4 test. The first was completely negative (not pictured). The 3 in the pic we're at 15, 17 and 18 dpo. All very faint lines. I took a clear blue digital and it said not pregnant. Idk what's going on... what do you all think?