Pregnancy changes everything, including how much fluid your body actually needs.. Your blood volume increases by up to 50 percent to supply the placenta and support your baby. Your kidneys are filtering significantly more than usual. Amniotic fluid has to be produced and maintained. And if morning sickness is in the picture, it’s even harder to keep up.
The tricky part is that most dehydration symptoms during pregnancy look exactly like pregnancy symptoms. Which means they're easy to dismiss. Here is what to actually watch for:
Signs of dehydration:
1. You have a headache that will not go away
Dehydration is one of the most common and overlooked causes of headaches in pregnancy. Before reaching for anything else, try drinking something with electrolytes and waiting a few hours. You might be surprised how often that's all it takes. That said, persistent or severe headaches in pregnancy, especially with visual changes or swelling, should always be reported to your provider, as they can be a sign of preeclampsia.
2. Your urine is dark yellow
Pale straw-yellow is the goal. Dark yellow or amber means your kidneys are concentrating urine to conserve water, a reliable early signal that you need more fluid. It's one of the easiest signs to catch and worth a quick check every time you go.
(One note: prenatal vitamins with B vitamins can temporarily make urine look bright yellow — that's the riboflavin, not dehydration. Dark amber or orange is still worth paying attention to.)
3. You feel dizzy or lightheaded
Some lightheadedness when you stand up quickly is normal in pregnancy due to shifts in blood pressure and increased blood volume demands. But if it's happening frequently or feels more significant, fluid intake is the first thing to look at. Dehydration reduces blood volume, which can worsen that dizzy feeling.
4. You're getting leg cramps — especially at night
That sudden, seize-up calf cramp at 2am is one of the most common signs that your body is running low on fluids and electrolytes. Dehydration depletes the magnesium, calcium, and potassium your muscles need to contract and release properly, and plain water doesn't replace them. If cramping is an issue, electrolytes are a necessary part of the fix.
5. You are getting more Braxton Hicks than usual
Dehydration is a known trigger for Braxton Hicks contractions because low fluid levels reduce blood volume, which decreases circulation to the uterus, and the uterus responds by contracting. If they are coming more frequently than normal, try hydrating (with electrolytes).. If they do not settle down or start to feel different, call your provider.
6. You are exhausted in a way that sleep does not fix
Pregnancy fatigue is real, but dehydration makes it worse. Even mild dehydration has been shown to impair energy, mood, and cognitive function. If you've had a low-fluid day and your energy has dropped off a cliff, hydrating with electrolytes might help.
What to do about it
1. Start hydrating now – with electrolytes. Electrolytes help your cells actually absorb and use the fluid you're taking in.
2. Know your target. Aim for around 8–10 cups (64–80 oz) of fluid daily, more if it's warm, you've been active, or nausea has been making it hard to keep up. Your provider is your best source for a personalized number.
3. When in doubt, call your provider. If you're experiencing dizziness, a racing heart, or you can't keep fluids down or your gut tells you something is off, it’s worth a call. Your OB or midwife would always rather hear from you than have you wondering.
Get hydration made for pregnancy – electrolytes specific to stage:
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