6wks and fainting with blackouts 😨⁉️

So I'm 6wks as of today and all of a sudden around 3am i was experiencing bad shortness of breath, dizzy, weak and fainted three times with blackouts. Never had that happen before so naturally I'm scared and was alone for that. At the ER to check on my peanut and hope everything is ok! I was reading on here that now that the heart is forming there is a rush of blood going through my body for the baby which can cause dizziness and fainting and that's how some find out they're pregnant. Idk, i'd rather be safe than sorry for the baby's sake but has this happened to any of you yet or at all??!!