I can't give you answers about Pregnosis, but I can tell you that you may be testing too early to detect HCG levels to get a + reading, hope that helps.

As for maybe baby, I only use it as a guide for when to
Basically when you see ferns, it means you are in a fertile period. You may have already "o" but it just reads it that way. Its confusing, so I tend to only use Maybe Baby from CD12-19 as this is around the time I "o" after that I chuck it in a cupboard so it doesn't confuse me...

Hope this helps...