Helpppp

Ashlyn

I came off birth control 2 months ago and am currently TTC. I had my withdrawal bleed and then another period, but I am now 16 days late. Yesterday I had the lightest pink spotting only once and only when I wiped. I tested a few days ago and it was negative. Could that be implantation bleeding? If so, how soon should I expect a positive/when should I test again?