Why Have I Not Got Periods After Taking The I Pill ?

I am 21 years of age I had my menses on 28 th of October upto 2nd of November .Then on 4 th,5th &6th of November I went for Intercourse (Sex) with my husband without any protection (condom ) ,But all i did was took one (1) ipill on 5th November within 20hours of sex and the second (2) ipill on 6th November Afternoon within19 hours of sex. Then i got my menses (periods) almost in mid of the month that is 17th of November up to 22nd of November ,Otherwise i always use to get my periods by the end of the month that is later than 27 th of every month. I again had intercourse (sex) with my husband on 24 th of November without condom ,but within 30 hours of unprotected sex i consumed one (1) ipill . Today is 26th of December almost more than a month and still i have not got my menses (periods) .Is it so ? that i am pregnant? Or is this just a shift in menses (periods) Why i am not getting my menses (periods). when will i get my menses ? Pls do respond to my Query. Thanking you