Chart help please? What is going on??

[WillowRose1411]

Hello!

I took my temp this morning at the time I usually take it and it was 36.68, I then took it 5 minutes later and it was 36.53. I hadn’t moved, drank etc I just sometimes like to double check with a 2nd temp.

Now when I typed the lower temp in it moved my ovulation day back to cd15 however if I type in the higher temp it calculates cd17. I have no idea what is going on and wondered if anyone could tell me which chart looked the most likely please?
Also is it normal for my temp to be so different within 5 minutes, especially going down not up? 😂😂
Just not sure if I’m 8dpo or 10dpo and when to test.
Thanks in advance to anyone who can shed some light!

Also the higher temp on cd16 was a night I’d been up and down with my daughter so sleep disruption may have effected that reading hence the open circle on the chart

@WillowRose1411 You shouldn't be taking your temperature twice, the first recorded temperature is the correct one. And it matches up nicely with your OPK results.