What is my body doing — losing my mind!

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Got a faint positive last week... negative Sunday and Monday. Then yesterday got a stronger positive bc I was 4 days late on my period. Started with light/medium flow for 3hrs then spotting the rest of the day. And spotting all day today. So light that it would take all day to fill a super tampon .... 😭 I haven’t had a chance to take another test to see If the line is darker. But my periods are NEVER like this. And last time I had a chemical pregnancy I had a really heavy flow for a couple days.