Omg I think I screwed up help

Jennifer
Ok so I had my period the 15 trough the 19 I was using a different period app and just discovered this one today my other period app said I was fertil the 18th through the 23rd we'll me and my boyfriend had sex this morning and he used the pull out method when I downloaded this app it says I'm 33 percent fertil is there a big chance I'm pregnant now 

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