Does it sound like i'm pregnant?

i recently switched pills..was on brevinor for almost 4 years and am now on yasmin (with just 2 months) i stopped taking the pills almost 5 days ago and still havent got my period?the 1st month i started taking it i got my period 2 days after i finished the pack just like the brevinor.but my period is a no show.should i be worried?