You may qualify for a Special Enrollment Period:

Even though the open enrollment period is over, you may still be able to get 2015 coverage. Certain life changes like losing your coverage, having a child, turning 26, moving, or getting married may qualify you for a Special Enrollment Period.

Important: If you qualify for a Special Enrollment Period, you’ll have 60 days from the time the life event occurs to enroll.  Take time today to see if you can still get Marketplace coverage. The HealthCare.gov Team