I'm having my second ultrasound on the 19th, I only had one before and it was so early we could only see a blob that looked a little weird and NOTHING like a baby (think almost 7 weeks)

I conceived this baby 10 months pp and just 2 months after getting off birth control, I know both factors can increase chances of twins and since we didnt see much of anything on my last ultrasound I'm so excited to see if maybe there is one in there

My question is how many mommas out there missed a twin at 7 weeks and then found it again at their next ultrasound? I'll be 16w and 3d but I heard it isnt common to miss a twin