Hi @Blackthumb,
Welcome to the forums! Sorry to hear your seed didn’t pop! 3 weeks is much longer than I’d wait, usually fresh seeds will pop within 3-5 days. You may have a bit of algae growth on top of the pod if it was wet for 3 weeks in the full blast of the light. Usually the plant comes up and covers the coco pod, and the lower water level dries it out enough to combat any algae growth. It’s not harmful and can be wiped off if you wish.
It is indeed time to start again my friend, sorry.
Best,
Stephen