Had sex on june 27 took ella (ulipristal acetate) july 1 my period usually comes on the 10th but it didnt come could i be pregnant its now july 17 2015?

Possible: Ella (ulipristal acetate) is an emergency contraceptive that can be used as much as 5 days after unprotected intercourse. It delays ovulation giving sperm time to die. This also means a delay in your period. That may be why your period is late. However, it, like all emergency contraceptives, is not 100% effective. To know for sure, do a pregnancy test and, if it is negative, repeat it in 3-5 days. Hope this helps.