Update: Negative

I'm confuse my period was suppose to start the 6th but it didn't. I noted it was late it moved down 2 days which still no sign of it. So here we are today it was suppose to start and still nothing. I'm taking clear blue digital to get a accurate reading. Should I switch to the line test? I look pregnant my stomach looks like it's growing but the test keep coming back negative.

update:

I went and got a first response test and still negative. my period was suppose to start today but still nothing so glow pushed it out 2 more days. any other suggestions, come tomorrow I will be 1 week late.