Pregnant? I’m confused.

I’ve been taking pregnancy tests everyday for the past 5 days. The only reason for that is because my first test I got a very faint positive. Every test after that has been the same. Well about 4am this morning I took another FRER which had a pretty strong line that you could easily see, and I thought I was making progress. I took another FRER at 10am, and it’s back to being super faint. What’s going on? Am I pregnant or not? I guess I’m driving myself crazy trying to figure it out. Has anyone had the same thing happen, and actually been pregnant? If it makes a difference I am 10w PP, and I still haven’t had a regular period. I had some brown spotting for about 4 days 2 weeks ago which isn’t normal for me. I just kinda ignored it since I did just have a baby, but now I’m wondering if it was implantation discharge? TIA!