[FEATURE] Add the ability to pause period tracking

[joelostblom]

Is your feature request related to a problem? Please describe.
If a period is not recorded for a month, it seems like the tracker continues to run until the next recorded period. This can create a very long periods in the logs such as this one for 117 days:

Describe the solution you'd like
It would be great if there was a way to indicate why a month did not have a period recorded. For example, the person might simply have forgotten to record it, they might have become pregnant, be under extreme stress, etc. For all these options (pregnancy in particular) I think it would make sense if menstrudel gave the user an option to pause the tracking until the next time they manually record a period. Users might also like being able to note the reason to differentiate between some of the causes I mentioned above when they look back at their logs.

Describe alternatives you've considered
There could be some prompting in addition to manually recording: "It seems like you haven't recorded any period for 40 days, did you miss to record one last month?" and then give some reasons to choose from maybe.

Additional context
I'm not sure if these long period currently might throw off any of the predictions as well or if they are discarded due to their length.

[J-shw]

This is another interesting point @joelostblom

Currently I do have some basic validation checks for period data before creating any predictions, but I allow a wide range between periods due to those who use Contraceptive pills. These users will have large cycles due to the contraceptives blocking their natural cycle until they choose.

That said, I like this idea primarily for users (as you mentioned) who may become pregnant.

There could be some prompting in addition to manually recording: "It seems like you haven't recorded any period for 40 days, did you miss to record one last month?" and then give some reasons to choose from maybe.

This is the most challenging part of the feature. I am not sure right now on a solution, but think this is something that needs to be thought about.

[joelostblom]

Great to hear that you think this could be valuable too @J-shw! For a first implementation of this feature, I think the reminder functionality is not needed, but simply a manual option to indicate start and stop date of e.g. a pregnancy would already be really helpful.