BBT help!!

This is my first month tracking bbt and my chart is all over the place so far despite always temping around the same time before I get out of bed with a bbt thermometer. Sometimes I’ll lay in bed and check again a little later and it’s always the same. Any thoughts about this? Anyone else have such a big dip before ovulation?

Side note my lh strips are also lighter this morning after getting darker yesterday afternoon. Clear blue is still flashing smile. The app hasn’t adjusted yet.