What's going on?

I ovulated on February 13th. Hubby and I DTD on the 10th and the 13th. My period was due on the 27th but came 2 days early on the 25th. It was a very light period to start and then in the evening on the 26th it became a blood bath. On the 27th, it became light again and stopped by that evening. Now everyday since, I've been having brown spotting but only when I wipe. Not on my underwear or anything. My periods are only 3 days long ever and are always on time. So I'm confused on what's going on. All pregnancy tests are negative. But this is kinda what happened when I was pregnant with my daughter other than I had gotten an actual positive pregnancy test. I bled off and on with her until 14 weeks to the point I thought I was having a miscarriage. Any insight?