Danger week, defined
Danger week is the stretch of the cycle when the odds flip against you. Everyone thinks it's day 14. It's actually a moving target about twelve days wide — here's the real math.
The definition
Danger week (n.) — the span of a menstrual cycle when conception is realistically on the table: the fertile window plus the safety margin around it. In RAWDOGGER it renders as the red and yellow days on the calendar, and the crew announces it without ceremony: "danger week starts Tuesday amigo."
Why it's not just day 14
The day-14 myth assumes a perfect 28-day cycle. Reality: ovulation happens about 14 days before the next period starts, so a 31-day cycle ovulates around day 17 and a 25-day cycle around day 11. Then biology stretches the window in both directions — sperm can survive up to 5 days waiting, and the egg is viable for about 24 hours after release. Add the fact that only ~13% of cycles run exactly 28 days, and the honest picture is a red core of about a week with yellow caution days on both shoulders — roughly days 8 through 19 on an average cycle. That's danger week the way "a minute" means "hold on a while."
When does yours start?
It depends entirely on her cycle length, which is the whole point of tracking instead of guessing. Enter the first day of her last period in RAWDOGGER and the calendar paints itself: red core, yellow shoulders, green everywhere else. The free tier shows this week; Full Send shows the whole month so you can see the next danger week coming like weather.
The disclaimer that is also the pitch
Knowing the danger week does not make green days risk-free — calendar methods fail around 24% per year in typical use, precisely because cycles drift and humans round off. RAWDOGGER exists to replace zero information with honest information, not to promise you anything. It's a cycle awareness tool, not a contraceptive and not medical advice. Know the window. Here's the full biology.