Ahhhhhh someone help!!!?

my girlfriend and i had sex yesterday well what would be 2 days ago now since its 1 am here. but we were protected. she is freaking out about being pregnant because her period tracker( iphone app) says she started ovulating the day we had sex. we got her ovulation tests today and she used one and one bar wa slighter than the other which im pretty sure it means she isnt ovulating. and if she doesnt ovulate for 3 or 4 more days we should be good right? it was a day between having sex and testing ovulation......should we be worried?