My period is 12 weeks late and is normally regular bar the odd day or so sometimes but never this length. I have a few pregnancy symptoms such as tender breasts / nipples, frequency of urination and tiredness but a negative pregnancy test!

Is it possible I am pregnant or what could be wrong?

See your doctor, they will be able to give you a more accurate pregnancy test and further advise you.

There could be many factors in loss of your period from stress to change in diet, you really need to go discuss this with your dr.

my period is 12 weeks late and is normally regular bar the odd day or so sometimes but never this length. i have a few pregnancy symptoms such as tender breasts / nipples, frequency of urination and tiredness but a negative pregnancy test!

is it possible i am pregnant or what could be wrong?
You should go and see your doctor. He/she will be able to tell you if you're pregnant.