Question?

Hi everyone, I’m hoping to get some insight from those of you more experienced with interpreting Oura trends. I got my ring on May 20th so I’m still pretty new to it and don’t have a huge baseline yet, but over the last few days I’ve noticed a pretty clear shift and I’m trying to figure out what could be behind it.

My recent readings:
HRV 48 → 44 → 28 today
Resting heart rate 68 → 64 → 75 today
Sleep debt is 0
Oura has shown major strain the past couple days, and minor strain today

I feel normal and nothing obvious has changed in my routine. My sleep has been consistent according to Oura, so I’m just trying to understand what else can cause a sudden drop in HRV with a rise in resting heart rate like this. Since I’m still new to the ring, I’m also wondering how much early data just tends to fluctuate while building a baseline. Has anyone seen this before and it ended up being something harmless or explainable? Thanks in advance, I’m just trying to learn how to read the patterns better.