What does it mean if you just had a period which was really light then three days later started to spot blood?

There are a few possible explanations for why you might have experienced light bleeding followed by spotting three days later. Some of the most common reasons include:

- Implantation bleeding: This occurs when a fertilized egg implants in the lining of your uterus. It is usually light and may be accompanied by mild cramps.

- Ovulation bleeding: Some women experience light bleeding or spotting around the time of ovulation, which is usually 14 days before their next period.

- Breakthrough bleeding: This can occur when the levels of estrogen and progesterone in your body fluctuate, such as during the first few months of taking oral contraceptives or when you are approaching menopause.

- Postpartum bleeding: If you have recently given birth, you may experience light bleeding or spotting for several weeks.

- Medical condition: In some cases, light bleeding followed by spotting may be a sign of an underlying medical condition, such as a miscarriage, ectopic pregnancy, or infection.

If you are concerned about your bleeding, it is always a good idea to talk to your doctor. They can help to determine the cause and recommend the best course of treatment.