Final answer:
Corpus luteum cysts typically resolve by the 12th week of pregnancy, as the placenta takes over hormone production and the corpus luteum degenerates.
Step-by-step explanation:
Corpus luteum cysts should resolve by the 12th week of pregnancy. The corpus luteum, which originates from the ruptured Graafian follicle following ovulation, plays a vital role during the early weeks of pregnancy. It produces hormones such as progesterone and estrogen which are crucial for maintaining the pregnancy before the placenta is fully developed. During weeks 7-12 from the Last Menstrual Period (LMP), the pregnancy hormones are primarily generated by the corpus luteum. By the time pregnancy reaches the 12 to 17 weeks, the placenta usually takes over the role as the primary endocrine organ, and the corpus luteum degenerates.