Could this be implantation?

It showed up 5 days after sex. I had this when I wiped. Then the same thing the following day, just a little darker. And then a little the 3rd day. Each day it just happened once. I’m breastfeeding and I don’t have a period so I’m not sure where I am in my cycle and I don’t usually spot at all. How soon after the bleeding ends can I test?

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