menstrual cycle question

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Hi

I waited 39 days for this period, thought I had it, and used a tampax. The tip had some blood. That was yesterday and today i had only a trace of blood.

Is this normal? It's like spotting more than proper bleeding. It's the first time it's happened. Usually my periods are 5-6 days long and very heavy first two days.

Thanks

Could you be pregnant and could it be implantation? I had a spot of blood before by bfp.

I did a pregnancy test oday and it was negative...?