Welcome to the Wonderful World of Charting!!!
I think your chart looks absolutely normal. You had the initial high temps at the beginning during AF, like we almost all do, now you're dropping down and bouncing around in a more "usual" Pre-Ov temp range.
Personally, I think your chart looks good and steady... not erratic and all over the place, ya know? You wanna see a wacky lookin' chart, take a peek at mine this cycle. I am truly all over the place!
As for a temp "flatline", I don't really think you need to worry about that. I've gotten the
exact same temperature
5 out of 6 days in a row before and had my cycle move on just fine. It's more of an issue when the overall chart shows flat-lined temps.
I think you'll be moving into the fertile phase of your cycle pretty soon. Definitely keep an eye on your CM and keep BD'ing!!
Best of Luck to you!!!