Am I pregnant?

I am nauseated, fatigued, have super sore breasts, and back pain. I have take 4 tests. One of which was a very very faint positive line (first test I took). The other 3 came back negative. They were all taken in the morning as soon as I woke up. I had my last period almost 4 weeks ago so if I am I would be extremely early. I’m I just overthinking things? Help!