When to test with IB

I started what I think could be implantation bleeding, it's definitely no where near my normal period anyway. I read that I cannot test yet because if it is truly implantation bleeding I won't have enough hcg in my system. It said I could test 5-7 days after implantation bleeding if that's what it is, but does that mean 5-7 days after it started it after it ended?