If you use a HPT with 10 mIU sensitivity 12 days after ovulation it is negative can still be pregnant?

Yes. It is still possible that you may be pregnant even if you have a negative HPT result with 10 mIU sensitivity 12 days after ovulation.

Here are a few reasons why:

Implantation Timing: While implantation typically occurs 6-12 days after ovulation, it can sometimes take up to 14 days. If implantation occurs later, it may not produce enough hCG (the pregnancy hormone detected by HPTs) to be detectable on a 10 mIU HPT 12 days after ovulation.

HCG Levels: The concentration of hCG increases rapidly in early pregnancy, but the rate at which it increases varies from person to person. Some people may have relatively lower levels of hCG in the first few weeks of pregnancy, making it harder to detect on an early HPT.

HPT Sensitivity: The sensitivity of a HPT refers to the lowest level of hCG it can detect. HPTs with a sensitivity of 10 mIU are generally considered early detection tests, but they may not be able to pick up very low levels of hCG.

Test Timing: The time of day and hydration levels can also impact the accuracy of HPTs. It's recommended to take the HPT first thing in the morning with the first urine of the day and to avoid excessive fluid intake before the test.

Therefore, if you received a negative result 12 days after ovulation, but your period doesn't start within a few days or if you have any pregnancy symptoms, it's advisable to take another HPT a few days later or contact a healthcare professional for further evaluation.