Today has been really weird. I feel like I can't distinguish my thoughts or imagination from real…

Today has been really weird. I feel like I can't distinguish my thoughts or imagination from real life. It's really hard to explain, like I don't know if something really happened or if I'm just imagining things. My memory is so shot today, I can't give an example because I don't know if it happened either. I feel like I'm going crazy.. I told my friend about it and she said pregnancy craze or something like that. I never had this with my first. I feel like I'm not actually here and I don't know what's really going on around me. It's actually kind of scary. I feel slightly light headed, almost floating. I feel lost. I tried explaining it to my SO and he just gave me a weird look...