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So confused on what day I ovulated on

Michaela • Fri, Jan 22

Ok according to glow my fertile window is the 15 th to the 21st I am not sure what day I ovulated on because every time one looks Dar then the next one is light the dark again. My period started on the 1st and ended on the 7th. When should I be starting my next period if I go on a 28 to 32 cycle?