implantation bleeding??

Yesterday I found this after sticking my finger in to see any CM. This morning I felt cramping and my stomach was hurting bad, so I stuck my finger inside of me again and it was brown. My AF Doesn't start till 6 days. So about 5 minutes ago I check in my underwear to find its all brown. And I know it's not my period because when I start it's really really heavy and red. I've been TTC 8 months now. And I'm 7 DPO