If you run home pregnancy tests frequently after a suspected conception, you'll feel the temptation: the result looks promising on day three, excitement is building, and you want the confirmation. Or the opposite, the home pregnancy test result is negative, and you want to pull the plug before you "waste" more on excessive testing frequency.
Immediately after suspected conception, the body produces human chorionic gonadotropin, and many want to track hCG levels for early insights.
The hard part isn't the math. It's Decision making under pressure, with messy attribution, imperfect analytics, and real life on the line.
Here's how I decide when to stop test early without turning experimentation into a story I tell myself.