Implantation dip?

Jennifer • Been ttc #1 for 4 years my fiancé is 32 and I`m 32 will be going for IUI soon 😊
I'm 12 dpo and had a dip my luteal phase is usually 15 days. What do u think? Been ttc for 4 yrs 😞 🙏🏻🙏🏻🙏🏻 

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