Implantation or period?

My periods are usually normal however back in October 2018 I was in a bad accident and haven’t had a visit from AF until 01-15-2018. However it was very light and mostly pink/brown and only lasted two days. Usually my periods are medium to heavy and last 5-7 days. I’ve taken 3 tests and all have been negative. Last test being 01-06-2018. I’m just curious for your opinions. Thanks.

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