Please help! Spotting 10 days after period

So a little backstory, my last expected period was due July 8th. I started early on July 2nd and only bled for 3 days.(I normally bleed for 5-7) there were no cramps which isn't normal. Now for the last few days I've been spotting, not enough to fill a light tampon all day. But it's been consistent. And it's a little heavier after sex. No pain. Anyone have any ideas? I'm trying to get into my doctors office this week. Also I took a pregnancy test 2 days ago and it was negative. We've been ttc for 6 months