confused

Jetaun

Help.... so I'm on cycle day 13 period came on the 29th of July I'm due to ovualate in the next couple days according to Glow, Flo and My monthly cycle but I took a ovulation test this morning and it showed no LH surge also yesterday and today I can see a brown discharge when I wipe I'm confused why I don't have any surge when I'm due to O soon any ideals or suggestions