Faint lines?! Please help!

I have been getting faint positive pregnancy tests since Monday, even got 2 positive digital tests. The tests have not been getting lighter, but not darker either. I went to the doctor today and had a urine test. She said the results were negative because a line did not show up in the 5 minute window but a faint line appeared after 5 minutes. She said it is definitely picking up something but maybe just too early to tell. I had blood drawn and will hear results on Monday.

Has this happened to anyone before? What do you think this means?