False negatives are usually a matter of when the test is taken - nursing won't affect the hormone it tests for.
I've had a false positive, though I wasn't nursing at the time, and it broke my heart...I was lucky and got pregnant 2 months later. A friend of mine got a false negative, tested a few weeks later (again) and ta da! Now her baby's 13 months old.
I agree. False positives are almost always true positives that end up being an early miscarriage .
Quoting larissalarie:False negatives are quite common, nursing or not. It's false positives that are almost unheard of
I personally have never had a false negative or a false positive!
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