just off birth control

Yay for my first post!  I just went off birth control after having been on it 12 years.  The last 4 years I was on a seasonique like pill (aka only cycle ever 3 months).  I should've gotten my period 8 days ago if my body were to have gone back to normal.  pregnancy tests are showing negative.  Any chance I still could be pregnant or more likely my body is just getting back to "normal"?  Thanks!