Possible implantation dip?

Abby • Child of God✝️. Happily married 💍. 23 Yrs old. 💖👶🏼 DD 3rd May, '16. 💙👶🏼DS 22nd Jan, '18. DS 9th April, '19💙👶🏼 💖👶🏼 DD 17th Dec, '21 🤰 pregnant with #5 BOY 💙

I have never had this in any of my other bbts this is completely different. I am also on ferema so my periods are also on time to the tee. I still have a full week until I'm due ?

Been ttc for a year, please tell me this could be a positive sign 😭