Cerelle pills

Hello,just before i call the GP (Dont want to be silly) i change my pill for Cerelle. Im already in the second tablet. I already take 13pills from the second tablet and no period... is this normal? My breast are so so sensitive that i had to sleep with bra this evening.. and they are like this for 5 days.. i trully belive that im not pregnat.. but is normal for the period to be so late when you change the contraceptional pill??