Implantation bleeding is light spotting caused by a fertilized egg attaching to the uterine wall, usually 10 to 14 days after ovulation, lasting a few hours to about two days.
It is one of the earliest possible signs of pregnancy, and it is harmless. Tell it from a period by weight, color, and duration: spotting that a liner handles versus flow that soaks pads, pink or brown versus bright red, no clots, and one to two days versus most of a week. Cramps, if any, are milder than period cramps. Not everyone gets it, so no spotting does not mean no pregnancy. Timing a test: hCG needs a few days to build, so test on the day your period is due or after for a reliable read. Know the unsafe pattern: heavy or bright-red bleeding, clots, or bleeding with one-sided pelvic pain, dizziness, or shoulder-tip pain is not implantation bleeding; that combination can mean an ectopic pregnancy and needs urgent care.
What to do
Common questions
What is implantation bleeding?
Implantation bleeding is light spotting that can happen when a fertilized egg embeds into the lining of the uterus, roughly 10 to 14 days after ovulation, which is often right around when your period is due, hence the confusion. The differences from a period are in weight and length: implantation bleeding is spotting, not flow (a thin panty liner handles it, never soaking pads), it is typically pink or brown rather than bright red, it contains no clots, and it lasts a few hours to about two days, not the 4 to 7 days of a period. It may come with very mild cramping, lighter than period cramps. It is considered a normal early sign of pregnancy and needs no treatment, though not every pregnancy has it, so its absence means nothing. If you see spotting at the right time and suspect pregnancy, wait until the day your period is due (or a few days after) and take a test; earlier than that, hCG may still be too low to read. When to call a clinician instead: bleeding that is heavy, bright red, contains clots, or comes with one-sided pelvic pain, dizziness, or shoulder pain, since early pregnancy bleeding with pain can signal an ectopic pregnancy, which is an emergency.