Can a faint line disappear after time frame and it still be considered positive?

Yesterday I got what I considered a faint positive within 3-10 min. After the 10 min it was very hard to see. Af is due today, nothing yet. I have very sore breast, heartburn, headaches and very bloated with lower back pain. Has this happened to anyone and still ended up pregnant? I’m scared to test again so I may wait to see if af shows up first.

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