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The HCG should ~ double within 48 hours so your next blood test will tell you more. For now I would not worry and enjoy being pregnant. Congratulations and best wishes!

They didn't say they wanted to do another blood test. I did take first response tests from the beginning and first one was really light and 5 days later my test line was way darker than control line. That would mean levels were doubling right?

Whether levels are doubling or not cannot be determined by looking at HPT sticks. Another blood test, ~ 48 hours after the first test will give you a much better idea about the status of the pregnancy.