I must of ovulated late

So my first day of my last period was the 6th of August and my cycle length is between 31/35 by this I should be around 4 weeks but I think I ovulated late as Monday bank holiday in August I had very fertile vaginal discharge and I believe that's when I conceived. I taken a clear blue and said 1-2 weeks pregnant can't believe how quick I found out, has anyone ovulated much later than they thought?