Am i going crazy??

So im 8dpo and yesterday was so off for me like i was doing the weirdest things, even my colleagues noticed that i didnt seem like myself. Like my brain is fogged or i lost brain cells or something. Or I am very forgetful. Just started cramps today that are on and off, but my question is: Has anyone experienced brain fog or whatever you want to call it as an early pregnancy symptom? This has honestly never happened to me and is freaking me out a bit especially since i work in a daycare and work with the babies all day.