Reading your own chart gets easier the more charts you have seen. The Chart Interpretation Game gives you that practice: you are shown a real chart from the Fertility Friend Chart Gallery, and you decide which cycle day ovulation most likely occurred on.
Answer, and you find out immediately what Fertility Friend's ovulation detector would have concluded, and why. The charts are hand-picked and drawn at random, so it is a new game every time.
The game is in the Fertility Friend mobile app
Open the menu and tap Charting Game.
How It Works
- You are shown a chart with its fertility signs — temperatures, cervical fluid, and the rest — but no interpretation.
- You pick the cycle day you think ovulation happened on, or say the chart shows no ovulation pattern at all.
- You see the answer straight away, alongside what Fertility Friend's detector would have selected.
- Your running score is kept as a percentage over the charts you have played, and you can record it on the leaderboard when you finish.
Tips for a Better Score
- Consider every sign. Focusing on one sign alone will often hide the pattern.
- No single sign is conclusive. Any one sign can be affected by timing, measurement error, or something going on in your day. Interpretation comes from reading all of them together — which is exactly how Fertility Friend's ovulation detector works.
- Not every chart shows ovulation. "No ovulation pattern" is sometimes the right answer, and the game accepts it.
- Expect variety. The charts are deliberately diverse. Real charts rarely look like the textbook one.
Want to Go Deeper?
The game is practice, not instruction. If you want to understand why a chart reads the way it does, start with the free Charting Course — twenty lessons covering fertility signs, chart patterns and interpretation, with a certificate at the end. You can also browse the Chart Gallery the game draws from, and search it by keyword and criteria.
For the reasoning behind the detector itself, see Charting Q&A.