When did I ovulate?

Cara • Expecting our first baby Jan 1st 2016! Married my best friend after 8 years together 10/10/14.
Is it possible that I ovulated on the 7th and it took a while for the spike to show up in temp? I had a positive ovulation test on the 7th but not again after that. I also had cramping on the 7th and thought I was definitely ovulating but I didn't have a spike in temp until today. What do you think??