Discharge can be a sign, but not a garentee. I think if you are barely 3 weeks, that it might be a few days too early for a bfp. You could only be 7dpo or so, and that is definetly to early.
I would not give up hope though because headaches can be a sign as well.
Good Luck!! I'd test in about maybe 3-5 more days and see what happens

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