OPK decision

After reading the comments and suggestions left by everyone, next cycle I'm going to try the Answer OPKs. This cycle I picked up a set of first Response and CBE Digitals. Both were negative, but there was a temperature change. Now I'm really confused because I'm not sure if there was ovulation or not. The temperature spike leads me to believe there was. The lack of a positive on the OPK suggests there wasn't. I'll be doing the Answer ones twice a day next cycle and we'll see where this latest development leads.