I think cervix position is good to determine ov but apart from that its crap.
When your cervix disappears, and trust me its does! Its usually quite a time after BFP.
After ovulation, your cervix will drop lower in your vagina and feel firm, like the tip of your nose. During pregnancy, the cervix will rise a bit and become softer, but the timing of this happening will vary from woman to woman. For some, this will happen shortly before their period is due, but for other, this will not happen until quite a while after their pregnancy has been confirmed.
Cervix position is not used to determine pregnancy at the early stages xxx