I started taking my new pack of birth control (yaz) a week late and had unprotected sex three days later. Could I be pregnant?

Yes. Birth control only works when taken as directed. You should use alternative form of birth control until you have been on it for a month.
Yes you can. The birth control effects \may actually take one cycle to work, although it usually protects immediately a female from pregnancy if started late, as you did. If you miss your period, a pregnancy test is in order. However, it appears that the sexual activity took place just vbefore your fertile period! hope that is some consolation.
Yes. Starting the pill a week late may not have prevented ovulation. This included with unprotected sex, makes pregnancy a definite possibility.

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