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Hcg Levels After Ivf Calculator . 5% of women have detectable hcg levels right after implantation but the majority will show positive levels by 11 to 12 days after conception. Levels should then double every 48 hours from weeks four. Trudiogmor Hcg Level Table Ivf from trudiogmor.blogspot.com I agree that the range is wide and that the trend may be more inform. Hcg levels rise during the first 6 to 12 weeks of pregnancy then decline slowly during the second and third trimesters. In this calculator, a valid date format is required.