I know my cousin had an early scan which showed only one sac, then when she went for her 12 weeks scan they found twins!!!!!!!!!!!!!!!! So it is highly possible to be twins for you!!! Goodluck
Best of luck, my twins were clearly visable at 10 week but I didnt have an earlier scan. My cousin had confirmed twins at 12 weeks and then they found a triplet at her 20 week scan so anything can happen!
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