Ovulation on cycle day 26?

I didn't ovulate until cycle day 26 and I have a 30 day cycle.  I just started tracking my cycles again.  When I conceived by first baby in 2012 at 26 years old, I had sex on cycle days 11 and 16 but I wasn't tracking ovulation so I don't know the exact date I ovulated.  Why would I ovulate so late in my cycle now given that I am only 30 years old?  I know I ovulated on cycle day 26 this month because I was taking my bbt every day at the same time.