How to I work out my due date? I'm confused!

Right I'm really confused guys, my first day of my last period is the 10th May, which when I've put into the due date calculator it works out at 14th feb!! Buttt when worked backwards my conception date would then be the 24th of May which I know me and my partner didn't have sex on. Does your cycle come into play at all? I'm a 31 day cycle so from 10th May, that's feb 17th which works out as my conception day as 27th of May which we did have sex on. I might of answered my own question but I need someone's advice please!

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