Sayang, I know how worrying this feels, but please jangan stress dulu, okay? Since your doctor is already referring you to a specialist, that's the right move, sebab they need to see what's happening in there properly. A few of us mums had irregular periods juga, and timing buat scan tu memang boleh affect what they see, sometimes baby just belum nampak yet lagi depending on how far along you actually are. Go see the specialist and let them do proper checks, they'll give you clearer answers. Sending you strength, sayang.