period due today and still not here!! worry???

Kelsey
Today I am supposed to get my period. I started a new pack on the 30th of march. Except it was a new kind, same dosage though. I had sex a few times this month and always used a condom. I always take my pills at the same time everyday. It's the middle of the day and still have not gotten it. Is it because I changed brands? It's the same dosage. I just wish I could have some peace of mind?? Help and advice please