Pregnancy?

I had unprotected sex on Jan 21 he came in me, according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> I was ovulating and than again on feb 1 and my period was suppose to start 4 days ago says the app I took a pregnancy test yesterday and it came out negative was it too soon ? Or is my period just late