Chances of pregnancy?

After a terrible miscarriage around 5 months ago we decided to try again my hubby is mostly out of state working I only see him roughly 1 week every 6 weeks always at random times . After the miscarriage I lost track of my periods and ovulation. My last period started on Friday the 25th of August and we had un protected sex sep 6-7-8 what are the chances of pregnancy ???