I keep skipping my period but pregnancy test says negative

I am on the birth control pill and I have been for almost a year now. Last month I had sex and missed my period I took a couple of tests and they came up negative. I am now meant to get my period agian but I have missed it agian! I took another test and it still says negative! What is happening?

Pregnancy tests aren't always reliable. You should go to the doctor. Missed periods can also come about from stress or a change in diet. It could also be your birth control. Ask your doctor

Get a blood test from your doctor. Then if it's still negative, get her/him to figure out what's causing the missed periods.