First eggplant flower fell off, what do I do?

First time gardener here! I had the first flower of my eggplant fallen off and I don't know why. The plant itself seems healthy and not wilting.

I fertilized it on the first week of June and it seems to be growing well, except that yesterday I found that the flower scrunched up and this morning it fell off but no signs of fruiting yet (I think?).

I read that it could be due to stress or heat but I don't know what could be the culprit as we've been having rainy days for the past week (consistent temp in the high 20s °C).

I'm keeping cherry tomatoes on the same place and that plant is fruiting, I generally keep them under the same condition so I don't know what went wrong with the eggplant. Please help! TIA!