Signs having twins?

Lyndsey
I know silly question but what are some signs you could be having twins? Besides an ultrasound obviously lol. I don't get my first ultrasound till end of the week. I am convinced it could be twins in there.. 
Twins run heavily in both sides of our families. I found out I was pregnant around 2 weeks. The line was SO dark SO quick. I'm VERY nauseated all day every single day and nothing helps. Not even meds.

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