Brown spotting

How much spotting is “too much” spotting in the first trimester? I’m 6w 2d and I’ve been spotting daily for a week now. It’s only been a few drops a few times a day, not much at all. Most of it has been lighter/medium brown, indicating old blood. However today it was was a little darker than it’s been, but still not red or anything. It’s still a small amount, however I passed one small stringy clot. I’ve been wearing a super thin/tiny panty liner to keep track. I’m just really nervous. I’m going to call my doctor tomorrow. Last we checked, which was last Friday, my hcg levels were doubling just fine, and my progesterone is good too.

Has anyone spotted like this and been okay? Is this normal? How long can spotting last? FTM!