u/Acceptable-Stuff-550

Hi everyone, looking for help diagnosing my tomato plant. For reference I am in zone 9b. The leaves have started curling downward and drooping, mostly on the lower and outer leaves, but I don’t see any signs of pests or disease spots. The plant is still green overall and growing. A few details:

-Consistent watering schedule
-Raised bed with mulch
-Last fertilized May 1 with Espoma Tomato-tone (3-4-6)
-Added finely crushed eggshells around the soil about a week ago
-Full sun exposure

I haven’t noticed yellowing, holes, webbing, or bugs under the leaves. Temperatures have been warming up recently, so I’m wondering if it could be heat stress, watering issues, fertilizer, or something else.