Mucus plug: what you need to know

As you approach the end of your pregnancy, you will probably notice pink, mucus-like vaginal discharge. There's no need to panic — you're dealing with the mucus plug.

In this article, we will describe the mucus plug and explain the reasons for its loss, before looking at the time between this loss and labour, as well as the steps to take when you have suspicions.

The mucus plug — what is it and how do you recognise it?

During the very first months of your pregnancy, a build-up of mucus can be observed in the uterus, gradually forming a plug capable of blocking the passage of germs and bacteria.

Just before or during the 9th month, the mucus plug separates from the cervix and is released into your vaginal discharge as secretions. It can be clear, pink, or brown in colour and have a gel-like or viscous appearance. You may find traces of blood in it.

Following its detachment, the mucus plug can be released into the vaginal discharge either whole or in pieces. You will probably notice it during your personal hygiene routine or on your clothing, but it can also go unnoticed. If, however, you notice heavy bleeding similar to a period, we advise you to consult your gynaecologist.

The mucus plug can also serve as an analysis sample, in order to determine the level of prostaglandins and the risk of cervical infection.

What are the reasons for losing the mucus plug?

As your due date approaches, the gradual dilation of the cervix causes the mucus plug to detach. It is then expelled via the vagina. The loss of the mucus plug can signal the start of labour. In this case, other signs such as contractions and the breaking of waters will appear.

If you lose your mucus plug before the 8th month, it could be a sign of premature labour or other problems requiring the immediate intervention of a specialist.

When does labour begin after the loss of the mucus plug?

For some women, the loss of the mucus plug can occur 24 to 48 hours before the waters break. For others, it may be several weeks. The mucus plug can also be lost during labour itself.

It is impossible to determine with certainty when birth will occur from the loss of the mucus plug. But you can already at this stage seek medical advice for optimal monitoring and start packing your hospital bag.

Frequently Asked Questions

What is the state of the cervix after losing the mucus plug?

When a pregnant woman loses her mucus plug, a dilation of the cervix of up to 3 cm may be observed. This does not necessarily mean that labour is imminent. But it can cause light bleeding.

Is losing the mucus plug inevitable?

No, losing the mucus plug is not an obligatory phase. It also has no fixed timing and can vary from one woman to another, or from one birth to another.