My periods used to be somewhat irregular and I would skip a month or two. They have been back to normal on an exact 28 day cycle since November. I had unprotected sex when we were both drunk on what my app said was my most fertile day but I did not know that until later. He pulled out but we were doing it for quite a while. What are the chances I am pregnant now that I am four days late on my period and if it was two weeks ago is it too soon to take a pregnancy test?

Very good chance of pregnancy, no way to state odds.

But it is too early for test, you have to wait till you are 14 days late for best results