How I Used GPT to Analyse my Cycle Tracker & created my own Custom Cycle Tracker GPT


Like many women, I keep track of my menstrual cycle via an app, such as my iPhone’s Cycle Tracking on the Health App, Period Tracker & premium apps like Flo. Periodically (pun intented), I receive emails from my menstrual cycle app, providing me with data about my cycles. This data, (compiled into a PDF), is usually only accessible through the premium version (paid services).

Most of the time I would quickly scan through the monthly logs of my periods, symptoms, and ovulation stats. However, with my newfound proficiency in designing GPT prompts, I’ve decided to use GPT 4 to analyze my cycle tracker. I even went a step further than using AI to interpret and understand my personal data; I decided to create my own custom GPT for tracker my Menstrual Health.

To start I will discuss the steps I took to use AI to analyze my cycle data, from using the GPT 4 upload button to the initial prompt followed by the prompt design I used for creating my own custom GPT.

  • I downloaded my yearly menstrual cycle report into a PDF file. (This could also work with images)
  • Uploaded the file to GPT 4 with a structured prompt,
  • Prompt: ”Analyse the data in this PDF document, it is a 12 month summary of the menstrual cycle of a (insert age) yr old female. Highlight any cycle deviations that are deemed to be abnormal or above/below the average cycle for the stated age. If there are any deviations in the cycle please point them out, listed possible causes, exclude using my name”

This tasks can be adjusted to suite the amount of data you have about your menstrual health, your cycle can be analyzed on a month to month basis, 6 months or 12 months if you have data going back that far.


As for my custom GPT I started out with a GPT called Thought Process Navigator which I had created to help me ideate, develop and process any ideas I have. I started with my own research by reading up on the Menstrual cycle apps that I had and was using at the time. I wanted to be sure to understand the main functionalities behind a cycle tracker. From there I ideated my thoughts for a more customisable version that I would design my GPT on.

After I had structured my ideas, I used the structure to design the prompt instructions needed to create my custom GPT and the result is LunaTrack!

Menstrual Health Support Customized for You

LunaTrack aims to empower individuals by providing personalized, AI-driven menstrual health tracking and support. Our purpose is to make menstrual health management intuitive, insightful, and integrated into daily life.

This AI tool was created to ensure that every user feels understood, supported, and in control of their menstrual health. By leveraging advanced technology, LunaTrack offers personalized insights, predictions, and wellness tips tailored to each user’s unique cycle, promoting not just awareness but a deeper connection with one’s body.

  1. Period Logging: Allows users to easily enter start and end dates of their period, facilitating accurate tracking over time.
  2. Symptom Recording: Users can log various symptoms (e.g., cramps, mood swings, energy levels) to monitor patterns and triggers.
  3. Cycle Factors Monitoring: Features for tracking unique cycle factors like lactation, contraception use, or any other condition affecting the menstrual cycle.
  1. Next Period Prediction: Utilizes historical cycle data to predict the start date of the next period with increasing accuracy over time.
  2. Fertility Window Forecasting: Helps in identifying fertile days for users trying to conceive, based on cycle data and ovulation estimates.
  3. Ovulation Estimation: Calculates and predicts ovulation days to aid in fertility planning or understanding cycle health better.
  1. Personalized Tips: Offers tips and recommendations for managing symptoms or improving menstrual health, based on logged data and preferences.
  2. Medical Article Insights: Integrates evidence-based medical research into user recommendations, ensuring advice is grounded in science.
  3. Holistic Techniques Integration: Includes insights on lunar phases, cycle syncing, and natural remedies, offering a well-rounded approach to menstrual health.

After putting my ideas into a structure, I created LunaTrack with the specifics of what I needed my Custom GPT to do.

I tested LunaTrack out with myself and I was happy with the results after iterating numerous times.
I asked LunaTrack one of the pre-set questions which was to provide me with personalised health tips based on my last cycle.


If you would like to test out LunaTrack on your GPT Plus you can access it directly here. I can honestly say its been an experience fun learning experience creating LunaTrack, It kept me intune with my Menstrual Health and got me asking some personal questions such as ”How do I really know about my own cycle and how its changed over time?” Now I don’t have to guess, I can take my cycle notes to LunaTrack and have a discussion about it within seconds. . . This is no way replaces taking any health concerns to a medical doctor, but this is a tool to have to give quick, insightful support.


If you would like to create your own Custom GPT you can get a step-by-step guide on the link below.

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