Cm leading up to ovulation ?

I had really watery slippry cm two weeks ago tomorrow , I thought maybe I was ovulating earlier .. According to glow (which is normally right) I'm in my fertile window and have a 27% chance of conceiving today . However if I acctually ovulated  two weeks ago my period would be due tomorrow . My cm changed from fertile , to thick and sticky , to now milky .. ? I don't know what to make out if it ...