Is 4-5 days after ovulation too soon for implantation dip in temperature?

I am ttc and charting my bbt. I got my positive opk on Sunday and Monday, my temps have been a little bit higher around .3-.5 degress higher and then this morning I have a hugh drop in temp of over 1.0 whole degree. Could this be an implantation dip. I hope so as I really want a baby! Thanks!