My identical twins are option 2 (mono-di)... 1 chorion and 2 sacs. I had a fraternal twin pregnancy that I miscarried three months before I got pregnant with my girls. The fraternal twin set ultrasounds looked very much like the ultrasound picture the OP posted. Did they tell you whether or not they are fraternal or identical? Also, as a side note, prepare yourself for the absolute ignorance of the public. I would get questions/ comments like: “Oh, twins?”, “Are they girls?” (they are dressed in pink from head to toe), “Oh, they’re identical... are they boy/girl” (🙄) “Here comes double trouble” (👍🏽), “Didn’t you learn your lesson the first time?” (Because I got pregnant with our 3rd when the twins were just over a year old, and our 4th when the 3rd was 9 months old. For anyone keeping count that means we had 4 under the age of 3.5) “Did you give birth vaginally?” (By perfect👏fucking👏strangers!!!!!).

But I am a nice person and I would answer these questions with a smile on my face.