Faint lines on my test

We have been trying to conceive for 4 months. The 2nd month I got faint lines and finally took a digital test which was positive. I had a miscarriage 4 days later. This is the 4th month and I have a very faint line again. I would take a digital but dont have one on hand right now? Does a faint line mean I'm pregnant? And if so why am I getting such faint lines? Am I low in progesterone? I have an appt with obgyn but not for a couple weeks yet, it's hard to get in. I need some advice thanks