Found some Hermies last night and took all the pollen sacs I could see. Now I'm not sure if I go until the end or abort the mission. They are 13 days

if they have been around male pollen and they had pistils yes it can take not even 24 hours for pollen to land on a pistil and that pistil will create a seed and if your breeding thats fine but if your not its bad it will create a seed though that seed wont be mature for at least 2-3 weeks mature enough to grow anyway.

UK420Show they are only 13 days flowering. will they have baby seeds already?

certainly looks that way my friend :) you can tell though just pull one off and look inside if theres a seed starting then yup shes pollentaned I recently had a tropical fuel plant hermie on me and pollentate 2 of my girls so i just pulled them early and stuck some clones in there :)