Why conception date is a range
Conception usually happens around ovulation, but ovulation timing, sperm survival, and record uncertainty can shift the likely date.
- From due date: estimate about 266 days earlier.
- From LMP: ovulation is often estimated around 14 days after LMP.
- From ovulation date: conception is usually close to ovulation.
Medical note
Conception date cannot usually be proven from dates alone. For medical, legal, or paternity questions, consult qualified professionals.