HELP!! Please ..GLOW says im ovulating .. AF DUE SEP 27

Okay !
So my glow says im ovulating .....
Yesterday and today were and are important days to have sex .... But I have Yet To get a positive OPK .... But my CM seems right ... Im just so confused on to why something feels right but getting negative OPKS ..... Been taking test since CD 10 .. Have a regular 29 day period cycle ... Just soooo confused ... AF DUE ON the 27th and I just don't know when to do the deed now Bc I've gotten nothing !   Does anyone have any insight ?