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Question about timing..

So i had my second Miscarriage(D&C) on jan 25th. I had what i think is my period february 22nd. My period only lasted 24-36 hours and was a little lighter than usual.

I took an opk today just out of curiosity. I feel like this is a really dark line for where i am in my cycle.. I know it’s not postive. I just feel like it’s too dark for cd7? Maybe i am wrong?