So I'm 4 weeks late I had taken one test last night which had came out with one really really faint line it was barely seeable and I've just done one today which came out negative. Not even a hint of a line. Has anyone has anything like this? Help.

Yesterday Angela told you, and Hippy just did, to see your doctor.

You NEED to go to the doctor RIGHT AWAY. You had a faint line yesterday, and now you don't . This COULD mean (notice I said COULD) that your body COULD have been producing the pregnancy hormone, and now it isn't.  That means your body needs to have an ultrasound  (that is "kind of" an X-ray) to see if a pregnancy HAD begun,  but stopped growing. You will need help with this from a doctor.

It is VERY IMPORTANT  for your health you see a doctor right away.

If you can not afford a doctor, depending on your age, you could call your local health department for an emergency appointment .

You NEED to talk with your mother or other trusted adult and tell them what's going on. Explain the pregnancy tests and their results. I usually don't give these answers, and leave just the answer "to see your doctor", but this is unusual circumstances and you need to realize the possibilities that may be going on. This exact thing happened to my niece.