No one can tell you what this bleeding is online. Implantation bleeding hasn't been proven as fact, and many doctors don't believe that it is medically possible.
As for the brown line on your belly, that's called the linea nigra, not all women get it, and if they do they don't get it until the second trimester of pregnancy. So it would be way too early for this to appear, unless you're already 4-6 months pregnant.
Wait until your next scheduled period is due. If you miss it, wait 2 weeks and then test using first morning urine. If that test is negative then wait until your next period is due, and test again if you miss it.
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