Did they miss a twin at first early scan?

I went in to get my due date from a ultrasound due to being on birth control and had no periods when I got pregnant. I found out I’m 6 weeks 2 days. That means I got my positive and trust me it was a dark positive at 2 weeks 4 days pregnant 😱 I also was horribly sick with tender boobs and headaches like every single symptom I had when I tested! My dr said it was to early to get a positive or feel pregnant ( like I’d lie 🤦‍♀️) she did a abdominal scan thinking I’d be much further along but I wasn’t. We have fraternal twins that run in our family and I was just curios if any of you ladies went early and was told just one baby and then later found out it was actually 2? I was trying to see my hcg levels from my blood work but they havnt posted my results yet. Picture of my BFP at only 2 weeks 4 days. I have had 3 other kids and no symptoms with any of them but getting a big belly 😂 and all my positives were around 4 to 5 weeks and faint