temp drop at 5 dpo.. worried..

I'm confused. my temp seemed to be getting higher and looking good than this morning I had a .6 temp drop. seems to be too early for a implantation dip. what could cause this? i did take my temp a little earlier than normal but it seems like a major difference for taking my temp a half hour earlier. (had go get up for work a little earlier. ) please tell me this is ok, and that I am not out. my period never shows up early so I doubt its AF coming

in previous months my temp stayed high and take no major dip until the day before AF arrived. thanks

already.