Implantation dip or wonky temp?


I don’t know what to make of the dip I had yesterday. I took my temp at the usual time as I always do, but had stayed up late the night before by a few hours, though I had still been sleeping for 6 hours before taking my temp. Is it unusual to get a dip like this? Is this the secondary estrogen surge or could it be implantation? Temp was high again like normal this morning.