Implantation bleeding?

Dr
Hey you guys, what does implantation bleeding look like? My husband and I had sex on my second most fertile day without even knowing it because my fertility window wasn't indicated in that day but then moved. We just started trying so I thought all these super early symptoms were just in my head but now I'm having light pink traces of blood and it's way to early to be my period. 
Could it be implantation bleeding? Does it happen more than once? And when's the earliest I can test? 

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