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How long before ovulating do you show signs of ovulation? - placement of cervix before menstruation

I read a lot lately about ovulation, because me and tried to understand my husbacnd. So far I've only read a few days before ovulation cm is clear, smooth and very sticky, very sticky u can stretch between your fingers. Well, this morning I noticed (it was the 1st time I saw in this cycle), but I realized that I was sticky could extend at least 3 cm also checked my cervix and placing much softer than normal and more open . I've also read that the egg only lasts 12 hours, but sperm can be up to 7 days. I try to find out, whether I'm ovulating today or pass, if in the next few days. Can someone help me please?