I took ella (ulipristal acetate) one on the 29 aug my period due was around 1 of sept then i had two times protected sex 30 & 2 now 3 weeks late am i preg?

Maybe: Sex leads to pregnancy, in many women. A urine pregnancy test gives a reliable result 3 weeks after sex (3 weeks after when conception might have occurred). If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and thus lead to a repeat test. If a woman gets her normal regular period, then she is not pregnant, and a test is not needed.