Could I be pregnant?

i was taking a birth control called yaz I was off of it for a week because I was switching over to another one called ortho cyclen I had only been on it like 2 days and had sexual intercourse and I dont get a period for almost another month and my breast have been tender an a little sore Please help could I be pregnant or have I worried myself?

You could be. Look at the information in the link below.

http://www.plannedparenthood.org/health-topics/pregnancy-4250.htm