feeling emotional 😭

I'm so confused and really down tonight I had want to the ER 31st of October due to heart palpitations:( I was being monitored and had EKG done they told me to eat bananas my potassium was a little low and something was off with my electrolytes had to take medication for that while I was there they did ultrasound and only seen a sac I'm very nervous my HCG levels where 6409 it has been progressing and doubling I should be 6 weeks today according to LMP I see my OB Thursday the doctor that treated me at the ER is concern of Ectopic pregnancy because they couldn't see anything on ultrasound just sac 😞 my lmp by the way was sep 19 i really need some positives vibes I'm over thinking and worried never had Ectopic pregnancy in my life have all healthy 3 babies one Miscarriage though :( 10 years ago !!