Very Pregnant! Twins?

Kristie
I'm only 7 weeks with my second child. I've had a confirmation of pregnancy appt already, ultrasound next week. I'm already showing. Its not bloating. I'm extremely tired, super nauseous, and feeling flutters (could be gas) . My question is, could it be twins? We dont have twins in our family. But its happened to two of my friends. Has this happened to anyone?