When to test?

Dariel • Wife💍, Believer ✝️, 20☺️, Soph Nursing Student 📗 Small Business Owner 💫 MTB of baby #1 🤰🏽🍼❤️ My Identical Twin Angels Delasia & Delasio 👼🏽

I normally have a 28-33 day cycle. However, last month i had a 39 day, i guess school had a girl stressed out haha. When is the best time for me to test?