If you did not use concentrated urine (in other words, if you did not use first morning urine) it is possible to get a negative on a test when you are pregnant. Try taking another test first thing in the morning before you have drunk any water.
Thanks but i took all my tests in the afternoon or late at night.but Thanks.i have an appointment next week.But i decided not to have sex anymore till marriage
It is possible. You are also only 15 so your periods may not be 100% regular yet but you shouldn't miss 2 months of your period. I would take a test using your first morning urine although by now you should be showing up positive but some people don't show up positive on a pregnancy test right away. Either way I would call your doctor because they may want to do some blood work. If you are not ready for children yet (and I hope you are not) I would talk to your doctor about birth control and def use a condom as that not only helps prevent pregnancy but other STD's. What you choose now will ultimately affect your future. Good luck hun and I hope you get your answer soon.
I guess you could be, it is very rare but some women do report home tests not working for them. Please try another home test, and follow the instructions exactly. (Especially, use first morning urine.) If it is also negative, go see your doctor and see if you have an ovarian cyst or something like that which is affecting your periods. Probably by now it goes without saying, but sweetheart, at 15 there is no reason to have unprotected sex. It has the potential to ruin your life. Please take care.