Was it AF? IB? Advice please

Ashley
I have long cycles, 38-40 days. About a week before AF was due, I lightly bled for two days. Then it stopped. This was Saturday and Sunday. Was that my period? Usually my period is 3 solid days, spotting on the 4th. It was my first month using opks, but I never noticed a surge. Ttc baby #1 for 15 months. Ovulation spotting? Short AF? IB? If it could have been implantation, when would I test? Thank you, ladies.

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