6 days late ?!

Holly • 1 baby girl & 1 step daughter, pregnant with baby #2 😁💙👶🤰👣

we are TTC I was on the nexaplanon for 4 years got it taken out late February and took the pill for 3 days had my first period with a few days of getting the implant out and have had my second cycle even I am now 6 days late and had bought a $1 test yesterday took it and was negative anyone have advice why this could be and if I should just wait a little longer and maybe retest again ?? TIA