Tubes tied and missed period!

Hello everyone,

This is my first post on here. So I use this app every single month to track my period and I’m never late. This month I’m late. Today makes day 6 and says cycle day 35. I’ve taken 2 tests and both are negative. My tubes have been tied 11 years. Should I worry? I’m not really sure when to call doctor or when to worry. Has anyone ever gone through this? Thanks for any advice