When Does Morning Sickness Start? A Timeline for Expectant Mothers (2023)

Discover when morning sickness starts, what causes it and how to cope with nausea and vomiting during pregnancy.

What is morning sickness?

Among the many emotions and feelings you’ll experience when you find out you’re pregnant, one of the less welcome is likely to be a feeling of nausea which can start when you’re five or six weeks pregnant.

Around 80% of expectant women experience morning sickness, usually during the first trimester of pregnancy, so it’s a normal part of the experience, if somewhat unpleasant. Symptoms of morning sickness range from fleeting mild nausea without vomiting to one or more bouts of vomiting every day.

When Does Morning Sickness Start? A Timeline for Expectant Mothers (1)

Thankfully, for most women, morning sickness tails off after 12 or 13 weeks of pregnancy and doesn’t cause too much disruption or suffering, with the woman able to manage her symptoms pretty well.

Although we call it morning sickness, nausea and vomiting in pregnancy (NVP) can happen at any time of day. It can be more common in the morning due to hormonal fluctuations and possibly low blood sugar before breakfast.

If you’re experiencing morning sickness, here’s what you need to know

  • Morning sickness is a normal feature of pregnancy, with around 80%, or four out of five, women experiencing some degree of nausea and/or vomiting

More on the causes of morning sickness

Those pesky hormones! Pregnancy is a hormonal rollercoaster, and your hCG levels can double every two or three days, causing quite a bit of chemical chaos.

In very early pregnancy, the collection of cells which will form your placenta produce hCG in large quantitiesto “tell” your womb lining to thicken and your placenta to grow so they can support your baby.

By the time you’re 11 or 12 weeks pregnant, your placenta and womb lining are pretty much fully formed and are doing their jobs nicely so your hCG starts to decline and it’s around this time that most women start to feel better.

It’s not just hCG behind morning sickness

We can’t blame hCG alone for making you feel sick, as oestrogen may also have a part to play, as well as progesterone. The levels of these two hormonesalso rise rapidly and this is thought to contribute to feelings of nausea.

NVP can also be compounded by low blood sugar. Growing a placenta takes a lot of energy and this can cause big fluctuations in your blood sugar levels. Low levels can often make you feel sick and, combined with your pregnancy hormones, low blood sugar is a recipe for NVP.

How to cope with morning sickness

For most pregnant women, morning sickness can be managed and so with a few adjustments and tricks you can carry on with your life pretty much as normal. Here are our best tips for dealing with pregnancy sickness.

Rest as much as possible

You’re doing something amazing, so allow yourself to rest up whenever you can. Tiredness can increase your feelings of sicknessand cause you to vomit more, so head to bed early and try to nap or at least chill during the day.

Eat little and often to stabilise your blood sugar

Aim to eat six or so times every day so that you’re not going too long between meals and also so that you’re not eating a great deal in one go as large meals can often - ahem - reappear. Complex carbs and not-too-fatty sources of proteinare your best friends here.

Stay well hydrated

Dehydration due to vomiting can make your feel even worse, so aim to drink 1.5 litres of water every day. You don’t have to chug down a pint in one go; sipping tiny amounts regularly is the way to do it, but do monitor your intake. Eating fresh fruit and vegetables is also a good way to keep up your water levels.

Try ginger sweets, biscuits and tea

Ginger can help to reduce feelings of nausea, as can peppermint, so suck on ginger-flavoured sweets or mints and drink some mint or ginger tea. This won’t cure your morning sickness, but it can reduce it for a while to help you to go about your day.

Build your pregnancy nausea into your day

If there’s a particular time of day you feel very sick or vomit then schedule your routine around it so it doesn’t interfere too much. For example, if you’re very nauseated at the time you usually commute into work, ask HR if you can come in slightly later.

Avoid your nausea triggers

You’ll know what they are with absolute certainty! They could be various cooking smells, eating particular foods or travelling in a car. Do your best to eliminate your triggers and if you do have to get into a car, try sipping fizzy water to quell the nausea.

When should you get help for your pregnancy sickness?

For some women, morning sickness can become serious. Hyperemesis gravidarum(HG), or excessive vomiting in pregnancy, is a severe form of NVP which can lead to dehydration and even malnutrition.

No one is sure of the exact figure, but it’s thought that between 1% and 3% of pregnant women suffer from HG. Hyperemesis tends to last longer than “regular” morning sickness, too, often persisting beyond 20 weeks and sometimes right for the entire pregnancy, although it does often reduce in severity.

You’re also more likely to develop HG if you’re expecting twins(or more), if you have a history of motion sickness and migraines and if you’ve had HG in a previous pregnancy.

The cause of HG is still something of a mystery, but some researchers believe it’s linked to the way individual hormones behave and interact. It’s still unlikely that this severe form of morning sickness will hurt your baby, especially if you get treatment.

You should call your doctor if:

  • You’ve been unable to keep food or fluids down for more than 24 hours
  • You're experiencing weight loss - losing 5% or more of your bodyweight due to NVP is deemed to be a serious case of HG
  • You’re peeing less than usual and your pee is very dark
  • You’re feeling dizzy and very tired
  • You have a headache
  • You’re unable to do some or most of your usual activities

There are safe treatments for hyperemesis gravidarum

Modern-day treatments for excessive NVP include antiemetic medications. These medicines have helped a lot of women with HG for several decades now and there’s no evidence to show they harm the baby.

Your doctor might give you the medicine as a tablet that you place between your top lip and gum so that it slowly dissolves, which is useful if you’re having difficulty keeping food and water down.

The meds give you two or three “windows” during the day when you can eat and drink to help you stay hydrated and nourished.

Having severe pregnancy sickness can be an isolating experience, especially if the people around you don’t understand what you’re going through or dismiss it as “normal” morning sickness. If you need to talk to someone, you can contact Pregnancy Sickness Supportfor help, advice and an understanding ear.

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