怀孕周期是指从受孕到生产之间的时期。医学上规定，以末次月经的第一天起计算预产期，整个孕期共为280天。由于每位女性月经周期长短不一，所以推测的预产期与实际预产期有1～2周的出入也是正常的。
狼的怀孕周期是多长？
玻璃环对于怀孕周期的检测育方法，准确性已经超过了95％。
CycleBeads are based on a natural family planning method that is more than 95% effective when used correctly.
人工引流增加乳腺癌的风险因为它终止了怀孕周期时女性正常的生理变化，而这个变化对降低乳腺癌是有帮助的。
Induced abortion boosts breast cancer risk because it stops the normal physiological changes in the breast that occur during a full term pregnancy and that lower a mother’s breast cancer risk.
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