cyst or ectopic?

Dee • Happily in love.❤️ Mother of two beautiful boys. Los Angeles, CA.
hey y'all, I am currently in the hospital due to an ultrasound that worried a few doctors. 
long story short, got my period this month. 4-9. on the 11th I started spotting. that went on for 14 days. checked in with my doctor. turned out I was pregnant. he did mention of the spotting continued check in to the ER. Saturday I went in, had no spotting but they said my levels were low. (565) to go back in on Monday, they should double. went back in on Monday. it only went up too (595) so they told me it may be an ectopic because the numbers didn't double. I checked in to the ER again, yesterday. my levels went up to 684. only this time they did a vag u/s and they noticed something on the right side of my uterus. outside. I am only 3 weeks a long. I haven't felt any pain what so ever. just strong headache. minor temps. & lower back pain. anyway, they basically admitted me so that they can terminate the pregnancy but I still do not want to believe. I'm probably only 3 weeks along and I feel it would be way too soon to see anything at this point. I stayed over night. but requested that I get more tests done & a 2nd opinion. has any one ever experienced anything like this?