Ultrasound twins or hematoma?

Lindsey
I had my first ultrasound today 5 weeks and 4 days. The doctor said that he at first there were two but then said I think it might be a hematoma. I have a repeat ultrasound in 2 weeks and he said that we will know at that time if it's twins or not. has anyone else had this happen and if so was it twins or a hematoma?