can you get pregnant on the period week of birth control pills?

Abigail
Hey everybody can I get pregnant on the period week of my birth control??? I have been taking this for about two years now and usually by this time I have started my period... But it's now day four and still nothing. My husband and I have been having unprotected sex but I'm just confused a bit. I took an at home test and the Prego test came out blank.