Help please!

Hi everyone! I’m charting my bbt for the first time this month and so confused! I am 10 DPO. My temp was rising after confirmed ovulation but has recently dropped slightly three days in a row but still remained above the cover line. I know an implantation dip is a one day big dip so that’s not this? Can I still be pregnant or is this a sign I’m getting my period? It is not expected for at least another 4 days I thought. Any and all help would be so greatly appreciated! I’ve posted charts from both apps