Hi I'm really late on my period. Probalby about 5-6 weeks late and I took a home pregnancy test and it got a negative result. But I have never missed a period before. What could be causing this?

There are many things that could cause a late period such as stress, weight gain or loss, etc. However, seeing that you are this late it is important you visit your doctor for a blood test and a complete physical. You need to find out what is causing this and have it corrected immediately.