Try isabgol for constipation! 
Increaee water intake 4liters per day. 
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Increase fluid intake,juices,eat fiber rich food,banana,milk,leafy vegies

It is due to dehydration.. try to increase fluid intake.. include fibre rich food in diet.. soaked raisins do wonders in constiption

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I am 11th week pregnant i have vomiting so i am taking tablet suggested by my doctor to control vomiting but i am facing constipation i dont know the reason i also avoiding spicy food also