Hi. I think a home pregnancy test should pick up a tubal pregnancy as there would still be the pregnancy hormone present (I forget what it is called).
When I went to the doctor complaining of pelvic pain they done a urine pregnancy test to make sure that it wasn't caused by an ectopic(tubal) pregnancy.
The signs start out the same as with any pregnancy (eg. nausea, increased urine frequency, tender breasts, etc). Did you have any spotting after your missed period? Or cramping and sharp pains in the abdomen?
These are all symptoms of a tubal pregnancy.
But if it is common for you to be late I wouldn't worry (unless you are experiencing any symptoms)...