I missed track of what day i was exactly on my cycle and realized ive only been 1 week post menstruation ( LMP 1.15.19). I entered my fertile window 1.24.19-1.31.19)...So im 3 weeks away from my next period. I had unprotected sex1.27.19 1or 4 day before possible ovulation during my 6day fertile window.is there a high chance of pregnancy?....obviously its a long time until i can take pregnancy test for a true reading. CaN someone help or explain?

Thank you