Egg retrieval today 10 mature follicles but only 4 eggs ...

Jessica
Did anyone else have this happen? This was my first round of <a href="https://glowing.com/glow-fertility-program">IVF</a> with unexplained infertility for 3 years. My doctor was surprised that most of my follicles were empty 😔. 🤞for those 4. 
Did anyone else have a similar experience? What happened?