Temp dip dpo 4 & 5

Kristina • Mom of two on earth and three in heaven. Praying for our third miracle 💕

Hey everyone. I think I ovulated on the 21st. Had fertile cervical mucous for 5 days and then had a temp rise. I got a dip on days 4 and 5 before it came back up. I did have congestion those days and slept with my mouth open. Could that affect this dip? Or could it be implantation dip? Any advice or thoughts are greatly appreciated!