TMI- Share your thoughts

I heard about implantation bleeding. Now I was suppose to start my period but this is what I'm getting...DARK CHOCOLATE COLOR brown blood. And when I wipe a very light light rosy pink color of just a little tiny blood. No actual flow like a period though. I had this same thing when I got pregnant last time. I've noticed I been fatigued, nauseous and had a high sensitivity to smell. I did my research and it says to test 2 to 3 days after this type of bleeding occurs so that by then I will have enough HCG for the test to detect. And to use a Early Response test. Could I be pregnant???? Oh and I had some anxiety out of no where like 45 minutes ago. Our daughter will be 3 month's old on the 25th by the grace of God.