Why is it hard for a woman to predict when she is pregnant?

predicting whether a test will be positive or negative is a difficult and useful prediction task, because it occurs in settings where the woman herself is sufficiently uncertain about whether she is pregnant that she believes taking a test is worthwhile.

Explanation:

it is not hard bc woman know when there pregant bc they would throw up in the moring and not have their period for awhile

Explanation:

a.) carbohydrates

i believe

if this is true of false i think it would be true