Pregnant?! Scared help!

I am not currently on any birth control and not trying to get pregnant. but I was ovulating during the week of Valentine's Day and after informing my so of this we still decided to have sex. During this time I was also having bleeding with my ovulation. Now it is 2 days pass when I was suppose to start my period and am very nervous! What should I do? Is my body just figuring itself out since I've only been of bc for a few months? Help!!