9 dpo 6 days before period, spotting after sex. Implantation? Help!

Heather • Baby #2 due March 2020!
Last night my husband and I had sex and when I wiped there was blood. It only lasted a few wipes and then it was gone and no more bleeding since so its not my period. Been TTC for 14 months and this has never happened before. I also had a slight dip in BBT this morning. Yesterday was 9dpo and 6 days before my period. Do you think this is implantation?

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