B vitamins and pregnancy


I used to take b complex vitamins before I fell pregnant to boost my energy. I stopped and replaced it with a prenatal vitamin but I’m sooo tired, like to the point I’m falling asleep at work. I’ll ask my doctor when I see him next but that’s not for a few more weeks, couldn’t find any advice online only that of folate but not a complex b vitamin that covers B1, B2, B3, B5, B6 and B12

I currently take omega 3, my pre natal, magnesium and extra iron

Does anyone have any advice?