Pregnancy brain

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I'm only six weeks pregnant but I swear I already have pregnancy brain! I'm being so forgetful! I even missed my hair appt and didn't realize it til tonight. I have NEVER missed a hair appt and omg I'm feeling so guilty that I was a no call no show! I'm going to call and apologize profusely tomorrow!! 
Any way my question is...does pregnancy brain start so soon?? Do you even believe in pregnancy brain? I don't know the scientifics behind it so I'm not sure it's even legit lol

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