When would you expect a positive?

Still so new at this TTC for 7 months this month, but have relaxed on testing and tracking this month as I was letting it get me into a stressful place. My last baby was unplanned so still getting to grips with the process. I’m 8dpo today (i know this test is negative) and I know still extremely early. I had pink discharge when I wiped last night, and then tinged brown this morning, wondering if it could be implantation? If it was, when would you expect to see a positive? Thanks girls x