Would you consider 2 BFN's in a row reliable?

Valentine
AF is due Tuesday/Wed., I tested yesterday (sat) and today (Sunday) with both resulting in bfns. Would you consider this reliable? I'm worried I had implantation bleeding on Thursday. Weird situation, had rough sex (sorry tmi) and bled a little bit on the way home. Light blood, lasted til the morning and got less and less, not red. I'm in bc and take it perfectly. Opinions?

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