Was I pregnant with twins?

Melissa • I am married to a wonderful man and a mom of 2 kids a handsome 5 year old boy and a 2 month old baby girl.
Hi ladies,
So I had some bleeding for a few days around Halloween. Then that Tuesday it was gone. I had blood drawn on that day and they came back with a 226 hcg level. I had to go back in on the Thursday and the levels were 913. Then yesterday I randomly started bleeding moderately and it had clots in it. I was scared I was miscarrying. My doctor had me go in and told me my cervix was closed and she only saw a little bit of blood. So she did an ultrasound and found a gestational sac and saw the yolk. So she said everything looked fine. I had asked if it was normal for women to pass clots while pregnant and she said every woman is different that some do and some don't. I had forgotten to ask her if I could have been loosing a twin since there were a lot of clots and since she had only seen one sac. Do you think it is possible?