I am 11 days late. Taken 3 tests, all different days and different times, all three were negative. What do I do next?

See your GP.
It could be late, but better safe than sorry!
I know it is nerve racking, but the sooner you find out the sooner you can deal with it. Mine is irregular 'up to two weeks gap in some parts of the year' but I would still guarantee seeing an expert to check.

All the best x

We are in the same boat excepts I am 13 days late so I guess the only thing to do is go to a dr and see what's really going on inside us