Ovulation???

Can you ovulate after your period and before your fertile days; what "Glow" has estimated for you? Or can you start to ovulate after your fertile days according to "Glow?" I remember having CM after my AF but before my "fertile days" during my "fertile week" I didn't see any CM; I was completely dried up but; experience intense lower back pain and abdominal cramping on the last day of my "ovulation week." So; I'm trying to pin point when did I actually ovulated or hoping I would have conceived?!? Lol
If any of this makes since to you? 
TTC baby #4