Am I pregnant ?

I am 5 days late to my period. I have taken two pregnancy tests. One at 1 day late and another one at 4 days late. They have both come out negative. I took my implant off in February and got my period after 8 weeks and then I had my period on time. Now it is late. Can the implant have something to do with me being late? Am I still adjusting to not being on it ?