What do you count as start day?

Nicole

Hi all! Im confused and need help! I started having light spotting march 16 continued through march 17 and then stopped for 2 days. Then full blown heavy period. Question is, did i start the 16th? Or the 20th? Im only worried because if it was the 16th then my period is late. If the 20th, then i still have a few days. Any ideas? TIA

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