Excessive fertile CM

For the last 4 days I have had A LOT of egg white CM it’s so bad that I have to change my underwear constantly throughout the day, I wake up in a huge sticky patch and it is so stringy and long I try to wipe it away and it just keeps coming.. according to glow I’m not in my fertile stage yet either! That’s in a few more days time.. I’m like clockwork every month and never had this before! I do get eggwhite CM but not this much or for this long and usually spot on when glow says I’m ovulating... what’s going on??