possible twins

Stephanie

so I had my first ultrasound today, and was told I could be having twins, or there is an artifact by the baby. they couldn't find it again after seeing it for a minute. so does anyone have experience with this did it turn out to be another baby hiding behind the other one, or just an artifact? I'm currently 6 weeks 6 days (according to baby measurements today) but period wise should be 7 weeks 3 days.