Very confused!!!

Ashley • Expecting my first Rainbow miracle ❤️🌈Two babies in heaven👶🏽👶🏽•Wife💍•NY🗽

So back in December I had an Ectopic thats what everyone had told me and I was treated with Methotrexate. They sent all the scans i had from my transvaginal scans to my Fertility doctor and he put in the notes that he believes it was a chemical pregnancy. When he only saw small mass so now I’m confused! Has anyone heard of this before?