The sensitivity of a specific test kit or lot could be decreased and there is variation between brands. You may also have ovulated slightly later in this cycle so the pregnancy is just not as far along compared to your first 3. While it is true that early miscarriages are quite common, which could be reflected in a slower rise in pregnancy hormone levels, it is way to early to conclude that.
Answered 6/14/2022
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The differences are within the normal variations in the timing of the positivity of the test.
Answered 6/14/2022
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