Im 15 and I haven't had my period for almost 3 months now,I'm sexually active with my boyfriend and I thought I was pregnant. But I took a test and it came back negative, I really don't know what to do,HELP?

Did you take the test using first morning urine?

Yeah,I got told it was the best time to get an accurate result?

Then most likely you are not pregnant, there are many medical reasons, so just go to the doctor, Women, esp after they are sexually active, need to be going to the doctor for check ups anyway.

There can be minor, but also major medical issues, so you really need to see a doctor. Many have nothing to do with having sex,

Ive had some minor signs of pregancy, like vomiting in a morning and sore breasts, could it be possible that it doesn't show on a test?

Yes. It's possible you are pregnant and got a false negative. Try taking another test in the morning.

Do you want to be pregnant at 15?