Saliva ovulation tests detecting pregnancy ..

I've been doing some research on saliva ovulation tests and i just want to see if i'm right in my research .. =D ..

So oestogen is produced just before we ovulate to stimulate the production on pregesterone and both increase until birth (if your pregnant) .. Now its the oestrogen that makes the crystalized pattern in your saliva when it dries (when viewed under microscope)..

Oestrogen also ceases to be produced if the egg doesnt implant .. So if im right does this mean that if we keep testing our salive after ovulation & intercourse and it keeps the crystalized pattern will that mean that we're pregnant?

Because if were not the oestrogen ceases and therefore we wont have a crystalized pattern .. does that make sense? Please tell me if you think im right .. im just curios its earlier then using a HPT .. =D Also i'm new on here so hiiii =D