Why do people test early?

Honest question, it confuses me. Surely it just makes sense to wait until you’re late and test then? I’d have spent so much money on tests if I did it every month but then again I never did get my bfp until <a href="https://glowing.com/glow-fertility-program">ivf</a>. That said, each to their own and good luck to everyone on their TTC journey however long or short it might be.