6 weeks dizzy spells

Just wondering if this is normal or if I should call my doctor? Since before I got my BFP I have been experiencing dizzy spells, varying in severity.. usually mild and if I go find a couch it goes away in a minute or two and just a tell tale sign I need to rest for a bit.. however twice in the past week or two I've gotten them so bad my vision blacks out for a couple seconds and I have to immediately sit wherever I am or I fear I will faint. Normal? Has anyone else experienced this? Also, I have been experiencing regular cramps which I know is normal, but yesterday I had the distinct feeling of a Braxton hicks contraction which seems incredibly early however I've been pregnant before and I remember the tightening and release feeling very well.. I drink at least a gallon of water a day if that is what anyone is thinking🤷🏼‍♀️ pic for attention