31y/o had a tubal ligation 7 years ago. i have never missed a cycle even when i was pregnant, now i'm 4 days late. do i need to worry?

Tubal ligation: fails roughly 1/100 to 1/200 times, depending on what method of ligation is used. Nor reason to worry: if you are late on a period do a pregnancy test today. If positive you need to call your doctor (or get one) ASAP, if negative you can wait a few weeks to see if/when the next period starts.

About 3 in 1000: women who have had tubals get pregnant. If concerned check a pregnancy test or see tour physician