Has anyone ever had a BFP with no positive on OPKs??

Milhu • 31yrs, DH 39... We have 2 girls, and working on our rainbow 🌈 baby.. Currently pregnant and praying this is it!!!
Im just wondering if I still possibly ovulated earlier and the OPKs just didn't detect it?? Has anyone EVER had a BFP with no positive on OPKs??