Question 1

What is implantation bleeding?

Accepted Answer

Implantation bleeding is light spotting that may occur when the embryo burrows into the uterine lining. It's usually pink or brown, very light, and lasts 1-2 days. Not everyone experiences it - only about 15-25% of pregnancies have noticeable implantation bleeding.

Question 2

Can I feel implantation happening?

Accepted Answer

Some women report mild cramping, twinges, or a 'pulling' sensation during implantation. However, many women feel nothing at all. Symptoms can also be from progesterone supplements, making it hard to distinguish true implantation sensations.

Question 3

Why is implantation timing important?

Accepted Answer

Understanding implantation timing helps set realistic expectations for when pregnancy tests might show positive. HCG must build up after implantation before tests can detect it, typically 2-4 days after the embryo attaches.

Question 4

What's the implantation window?

Accepted Answer

The implantation window is when the uterine lining is most receptive to embryo attachment, typically days 20-24 of a 28-day cycle (6-10 days after ovulation). In IVF, medications prepare the lining to be receptive on transfer day.

Question 5

Can an embryo implant late?

Accepted Answer

Yes, late implantation (after day 10 post-ovulation) can occur but is associated with higher risk of early loss. Most successful pregnancies implant by day 9-10 post-ovulation (or equivalent timing post-retrieval).

Question 6

Does bed rest help implantation?

Accepted Answer

Research shows bed rest after transfer doesn't improve implantation rates. Normal daily activities are fine. In fact, some studies suggest light movement may be beneficial. Follow your clinic's specific guidance.

Stage	5-Day Transfer	3-Day Transfer	What Happens
Hatching	Day 1	Day 3-4	Embryo breaks out of protective shell (zona pellucida)
Apposition	Day 1-2	Day 4-5	Embryo loosely attaches to uterine lining surface
Adhesion	Day 2-3	Day 5-6	Embryo firmly attaches to the endometrium
Invasion	Day 3-5	Day 6-8	Embryo burrows into lining, blood supply established
HCG Production	Day 4-6	Day 7-9	Pregnancy hormone enters bloodstream

When does implantation occur after IVF transfer?

IVF Implantation Calculator

Your Transfer Details

Stages of Implantation

Possible Implantation Symptoms

Light Spotting

Mild Cramping

Breast Tenderness

Temperature Dip

Track Your Symptoms

Frequently Asked Questions