No period- bfn

Jacqueline

My period is 8 days late. I’ve taken 3 pregnancy tests (all Medicare from the dollar store) all came back negative. I’ve never had a late period before. Should I be trying the more expensive tests? Are the dollar store ones accurate? (From the research I’ve done I thought they would be) Has anyone gotten so many negatives and still ended up pregnant? I know stressing about it can cause a missed period but I really don’t feel as though I am stressing much. Thanks in advance!!