Just started charting BBT

As

Any tips?

From what I understand, I'm looking for a temperature rise to indicate ovulation and a dip to indicate implantation... right?

Does it absolutely HAVE to be taken at the same time everyday?

Right now I've been setting my alarm for 3am (cause that's when my hubby gets home anyway). I wake up and try to move as little as possible while I grab the thermometer. I noticed that today I missed my alarm so I took it at 6am and my temp was more than a whole degree higher than usual. That's crazy how different it was just from the time difference. I was thinking maybe I moved around more than normal and that caused it but I don't know.