Anyone had a BFN turn into a BFP?

Ai
I'm TTC a rainbow baby. AF is still about 5 days off.  I've tested twice already because my cervix is closed and almost round and my CM has turned from creamy into egg white. This happened last time I was pregnant. So while I don't feel much affinity with my body lately I'm wondering if I might be very early in a pregnancy
Has anyone tested at 10 dpo and had a negative but then tested a few days later and had a BFP
Really appreciate views! 

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