If i had sex dec9th&11th. would it show 2-3 weeks preg on clear blue test december 27th or would i of had to have sec before the 9th&11th , i am preg.

Yes: Congratulations! The Clear Blue pregnancy test with weeks estimator can be used 4 days prior to your missed period but isn't always accurate until the missed period. It estimates the number of weeks SINCE OVULATION. This is a bit confusing because pregnancy is usually dated from the first day of your last period (about 2 weeks earlier). Ovulation Dec 10 should give you 2-3 weeks on Dec 27.