Please choose the correct ending to complete the given sentence: Health: [header] How to know the earliest pregnancy signs [title] Notice your overall energy level. [step] Fatigue is a common early sign of pregnancy. Even when you have not changed your routine or sleep schedule, you may feel tired throughout the day.

Ending1: Unexplained fatigue can be an early sign of pregnancy. [title] Take note of any changes in tastes. Ending2: It can also be triggered by frequent activities. [substeps] You may take naps when you need to get up in the mornings, like reading a book or watching tv while you wait for appointments. Ending3: Losing energy or feeling fatigued may indicate low functioning hormones that might make you feel fatigued. See how your body gets its energy from sleep. Ending4: Noticing your energy level may be the first sign of pregnancy. [substeps] Fluctuating levels of energy usually indicate pre-pregnancy.

Answer format: ending1/ending2/ending3/ending4