Predict Implantation Timing
Implantation usually occurs 6–10 days after ovulation or embryo transfer. Use this planner to identify likely implantation days and testing windows.
Default luteal phase assumed at 14 days.
How to Use This Calculator
Select your reference point
Use LMP/cycle length if ovulation date is unknown, otherwise choose precise ovulation or embryo transfer data.
Enter accurate dates
Precise data improves the implantation estimate and testing window.
Plan testing around the window
Urine pregnancy tests are usually reliable after implantation plus 2–3 days (≈12 DPO).
Formula
Estimated ovulation = LMP + (cycle length − 14) OR specified ovulation/transfer reference
Implantation window = Ovulation + 6 to Ovulation + 10 days
Earliest reliable hCG detection = Ovulation + 8–10 days (serum); Ovulation + 10–12 days (urine test)
Expected period = Ovulation + 14 days
Full Description
Implantation marks the embryo’s attachment to the uterine lining, typically 6–10 days after fertilization. Understanding this timing helps schedule pregnancy tests and interpret symptoms. IVF transfers introduce an embryo at a known developmental stage, allowing precise projections. While implantation timing varies, sustained luteal progesterone support and healthy endometrium are crucial for success.
Frequently Asked Questions
Can implantation occur earlier or later than predicted?
Yes. Implantation as early as 5 DPO or as late as 12 DPO has been documented, though extremes are less common.
Do implantation cramps or spotting confirm pregnancy?
Not definitively. They can mimic premenstrual symptoms. Only an hCG test confirms pregnancy.
Does progesterone supplementation change timing?
Progesterone supports the luteal phase but does not significantly shift implantation timing.
How does IVF implantation differ?
Implantation timing is similar, but embryos are introduced at a known stage (day 3 or 5), making projections more precise.