I'm so confused!

Keirsten
I'm 6 days late. I took a test tonight and it was negative. I was on the pill for 7years but went off of it in July of 2016 and my periods have been completely normal! But this month it just hasn't shown! I don't know if I should call my doctor or if it is just a delayed effect of the pill. Has anyone else experienced this or have any advice for me?