10dpo bleeding during sex... implantation?

Ch
I am 11dpo now, sorry if this post is tmi, yesterday my husband and I had sex and there was blood we noticed once we were done... I thought I was getting my period 4 days early, it wasn't a small amount, it was noticeable, mostly on him, like if you were on your period. We cleaned up and I put in a tampon and we went to bed. Woke up this morning changed tampon and no blood on it. Put in a new one because I'm convinced AF is coming at this point, changed it twice already today and nothing. Took a test and BFN...
I'm so confused 🤷‍♀️ 😐

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