Started my birth control pills the sunday after my period it's been4days of being on the pill i had unprotected sex he ejaculated in me am i pregnant?

Too soon to tell: Hopefully, the birth control pills are working, but it's too soon to tell about pregnancy. A urine pregnancy test, done correctly, gives a reliable result 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a "period". 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.