Unexplained spotting at 36 weeks?

Has anyone else experienced spotting at 36w? I’m 36w + 4d now and have had random light spotting for three days. I saw my doctor yesterday and he said my results are fine (baby is ok and placenta is ok), but he didn’t explain what it could be from. He told me to worry if the spotting fills up a panty liner, which it hasn’t, but still I’m just so anxious!

Please share if something similar has happened to you! I was hoping to be further along when I deliver, and I don’t know if this is a sign of labor...