TTC timing advice needed!

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I read this book that said if you TTC three days before you begin to ovulate you have higher chances of getting pregnant with a girl. We TTC on 9/24 and I began ovulating on Tuesday 9/27 and my peak day is 10/1. Now I just read that sperm only lives 5 days! So do you think I may have a chance of getting pregnant or should I screw the whole baby girl dream and TTC again tonight? Advice please :)