Help please. 😕

Courtney • 👼🏼 2-26-17 and now our Rainbow baby is here! 6-2-18 Carter Logan Freeborn 🌈👶🏼 and Easton Kent Freeborn due 7-26-19
Trying for our rainbow. My cycle is anywhere from 36-39 days and My last period was 5/21. Not sure on DPO anymore but I'm thinking 15-18 DPO.