Can I be pregnant?

I think I may be pregnant! I want to make this as clear as possible.

I've been on Ortho-Tricyclen for 7 years. January 3rd 2009 was the day of me finishing my pack from December, 2009. I didn't take the 7 sugar pills from 4th-10th. I normally would have started my cycle on the 7th or 8th. Instead i came on, on the 9th(friday) and went off that sunday 11th. I didn't start my new pack of pills on the 11th like i was suppose to, it was going on the 15th when i realized i was too late to even double up. so i decided to wait until i started my next cycle to start the new pack, which would have been the 4th of February(2days ago). In between that time, i had unprotected sex twice. I finally decided to take a home preg. test yesterday the 5th, and came out neg. and still haven't came on my cycle. could i be pregnant?