I have taken a pregnancy test 11days after sex and they all turned out negative could i still be pregnant?

Pregnancy: You didn't say when in your cycle you had sex so you could still be pregnant but it was too early to detect it. If your cycles are regular, you can wait until your expected menstrual period and repeat the test if your period is late.

Technique & timing: You may have tested too early. It is better to do the test 4-5 days after a missed period, use first morning urine and follow the directions in the kit carefully.