Help?

First off, I'm 19 and hubby and I are TTC #2. Between 5-8 dpo, 9 days before AF was expected to visit, I started spotting light pink. AF is supposed to visit tomorrow and I'm still spotting, although it's brown now. The spotting has stayed light enough that I only see it when I wipe, except for one day during which I had to wear a pantyliner. I've been nauseous, bloated, have had abdominal/pelvic cramping, lower back pain, body aches, fatigued, frequent headaches/migraines, increased urination. My breasts were sore for about 3 days, but they aren't anymore.