How long does pregnancy take to throw up?

The pregnancy may occur at about 4 to 6 weeks after conception.

Human chorionic gonadotropin (HCG) levels rise rapidly at about 4 to 6 weeks after conception, which is one of the important reasons for pregnancy vomiting. Large fluctuations in HCG levels can affect the normal function of the digestive system, causing nausea, vomiting and other symptoms

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