Ttc and I'm 4 days late on my period

Shinee Anne • Married since 12/31/14, I am 24 years old.
Hi, I'm new here. So I got my nexplanon out April 29th and I had my first period on May 27th-30th and I still haven't got my period this month yet. I also took home pregnancy test and it was negative. Am I irregular because I just got my birth control out or what? Anybody knows what's going on?