Postpartum day 28 bleeding, is it lochia or menstruation?

Patient's question:

Today is postpartum day 28. Around day 20 postpartum, the lochia was almost clean, but there was still a little pale yellow serous lochia. However, starting yesterday, fresh red blood suddenly appeared. Today, the amount is even more, similar to a regular menstrual period. I feel a bit of lower back pain, just like during a menstrual period. I don’t know if it’s menstruation or lochia? At postpartum day 28, the baby is still under a month old. How can menstruation come so soon? Is it poor uterine recovery causing bleeding, or is it menstruation?

Doctor's answer:

Hello, the situation you mentioned could be related to menstruation, but it's difficult to determine. You need to go to the hospital's obstetrics department for examination and confirmation.
Suggestions:
Generally, it is unlikely that the condition is caused by poor uterine recovery.
From a medical perspective, based on the histological characteristics of the endometrium, it is possible for the ovaries to ovulate as early as 33-42 days postpartum. Since your situation is earlier, you need to go to the hospital for examination to reach a definitive diagnosis.

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