Exact day you ovulate????????

Emma
Hi all,
I am new to Glow and I need help, 
I am a mum of 1, currently trying for baby number 2, I need some help as this is our first time trying and I am a little concerned about fertile days. Would I be right in the thinking the day that I have a 30% chance of pregnancy, will be the day I would more then likely be ovulating?? This is my biggest concern, if this is the case, if we baby make a day or two before this day, it would be a good chance of getting pregnant. 
Any advice or tips or help on this will be gratefully appreciated,
Thank you all :-) 

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