BBT chart

I now know to get a cover line you need 10 days of temps, attempting to do that now. Some days I forget and get up and go oh crap after a couple mins, other days I'm like ugh don't have time for that. So based on my chart is there a significant drop? Doesn't my temp have to be down near the day before ovulation to be counted as a big drop? I'm getting -HCG tests, I'm only 12DPO going to wait till sun to test again if AF doesn't show.