Help please

Adele • 27. TTC baby #1 for 11 months, born July 2015. TTC baby #2 since march 2016 BFP Aug 2017 MC at 5 weeks BFP Oct 2017 🌈 Rainbow baby due July 2018🌈

Any thoughts on my chart? I think I ovulated around day 11. Any reason my temps would drop around now though??