Yes its possible have you taken pregnancy tests .
I was 2 weeks late took 4 tests throught the 2 weeks and the first response said negative. Had blood work at doctors office two days later.. i was 4 weeks prego.
If you're already a week late you should be able to get a quick and easy answer to your question with a pregnancy test from the dollar store. I got a positive result four days before my expected period, there's no reason you should have to wait another whole week for an answer when you're already late.
Wait a week and take a test