Please choose the correct ending to complete the given sentence: Health: [header] How to get pregnant while breastfeeding with no period [title] Understand what charting is. [step] Charting can help you to determine when you are most fertile. When you know this specific time span, you have more of a chance of getting pregnant.

Ending1: [substeps] When you are only feeling fertile for a few days, you are more likely to have your period. Babies generally get their first one after about four months in adult females, though some women still get their first period six months after having an early period. Ending2: Fertility experts give you the option of planning for the mid-puberty phase of your menstrual cycle. This is not a vague idea, however. Ending3: Charting is done by tracking your basal body temperature, cervical position, cervical texture, and cervical mucus. [title] Keep track of your basal body temperature. Ending4: This helps you have more longterm odds of being pregnant. [substeps] Some women who have esl experience periods in their second trimester.

Answer format: ending1/ending2/ending3/ending4