Wait another 3-5 days or best, a week later to test again.
I kept getting negatives even with different kinds of kits and only got a positive after exactly 2 weeks of missed menses. The hcg level is still too low to detect that's the reason why
nag pa removed na po ako ng implanont contraceptives ko pwede kopo bamg malaman maari napo ba akong mabuntis kahit na ako reglahin?