Lloyd and luna are using a method of birth control that is based on ovulation prediction. this couple is using a(n) method

Lloyd and Luna are using a method of birth control that is based on ovulation prediction. This couple is using a rhythm or calendar method.

Explanation:

A rhythm or calendar method is natural birth control method which consists of avoiding having sexual intercourse during the days of ovulation. It's a natural method as there's no use of any contraceptive. However, its effectiveness is not very high as the ovulation must be calculated very thoroughly and that's not so easy to do. It's generally used by people who want to conceive: they calculate the ovulation days to schedule their sexual activity to have more chances to conceive.

i'm not sure i completely understand your question, but i will do my best.

i think the answer you are looking for is sequence. (see below)

a repeated melodic fragment would be best defined as repetition, while repeated chords (different or the same) could be a chord progression. however, you then mentioned the chord and melodic fragment beginning on higher or lower pitches, in that case, the answer could be best defined as a sequence. the definition of a sequence is as follows: "the restatement of a motif or longer melodic (or harmonic) passage at a higher or lower pitch in the same voice."

let me know if this !