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you can get a + at 7 dpo with a sensitive test but there not that reliable and the egg may not implant till day 10+.
the amount of hCG in your system will increase. At 10 days past ovulation, the average woman has an hCG measurement of right around 25 mIU. This amount doubles to 50 mIU at 12 days past ovulation, and then doubles again to 100 mIU at around two weeks past ovulation. Different tests have different levels of sensitivity;