Is it late or am I wrong?

My period is over a week late. When I was 4 days late I took a test and it was negative. Then at 7 days late I took a test and it was negative. My doctor told me I shouldn’t worry since it’s common to miss periods every so often and that 2 negative tests are pretty reliable but of course I’m on edge because I don’t want to be pregnant. What do you all think?