Community Moderators ensure that conversations are friendly, factual, and on-topic. We're here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
Welcome on board @Evanorden, it's nice to see you here! 
Have you checked the thread that my friend @SunsetRunner provided you? If that what you're experiencing?
If that is not what you're asking for, I'd like you to please provide us with more details about the issue you're experiencing. In case you're not able to edit your period, while in the period tracker, go to Settings in the top right corner. It should bring up the option to remove "predictions". Turn it off, set your period then turn predictions back on. This way it seems to just put in your average period days and not what the predicted end date would've been.
Can you please let me know if by doing these steps you can edit your periods correctly?
Keep in mind that if a period doesn’t meet the following requirements, you may receive an error and be unable to log the period:
- You can only add or edit current or past periods and details.
- A period must be at least 1 day.
- A period must be less than 11 days. If your period is longer, consider logging flow intensity details.
- A cycle must be at least 11 days, and there must be a gap of at least 1 day between logged periods. If you experience a gap in bleeding during your period, it’s still 1 period.
Note that If you attempt to log a period in the future or a period with less than a one-day gap between periods, the pencil icon is unavailable. If you don’t see the pencil icon, make sure the period you’re attempting to log or edit meets all of the requirements.
Looking forward to your response!
Best Answer