How does the timeline of implantation correlate with the menstrual cycle and affect pregnancy testing?

• A. Implantation aligns with ovulation, making pregnancy detectable immediately.
• B. Implantation prevents menstruation, detectable by day 14.
• C. Implantation occurs around day 20-24, allowing HCG detection by the expected menstrual cycle around day 28.
• D. Implantation occurs at the end of the cycle, delaying pregnancy detection until day 40.

Answer: (C)