https://www.fertilityfriend.com/home/43a979
This is my chart, i started temping late as i wasn't going to and then changed my mind, see big drop this morning!
Wow, that is a significant drop! But it's still too early to say anything about it with any certainty since you haven't been temping for a couple of cycles so you can't really see a pattern yet.
I have the same problem, though; I only started temping last cycle. It is kind of exciting to actually 'see' the body and hormones at work. Last cycle I didn't even have a clear drop in temperature, but I read that not all women experience that anyway. Usually after O there is supposed to be a drastic increase in BBT due to progesterone, but I had just a steady rise... I was able to predict when AF would knock on the door, that was kind of awesome.
As for the grapefruit juice (not GRAPE juice LOL

), I know lots of people really dislike the taste so I read somewhere on here that it can increase fertile CM and women were trying it for that reason but really hating it haha
Editing to say that grape juice actually exists! I always drank it when I was little and my parents were drinking wine...