Possibility of Twins?

Due sept 27. Had first u/s already. Only showed 1 baby, but baby didn't move around at all.. Like it was sleeping. HR was 132 so that's my guess. Anyway, I keep seeing things in twos! I cannot shake the feeling that there are 2 in there.. Even if we only saw 1. I'm having all the symptoms from my sons pregnancy, AND all the symptoms from my daughters.. Only double. Super tired.. More so than either of the other pregnancies. I'm just driving myself crazy with all these signs and symptoms! Pic is at 7 weeks 3 days. I'm 10 weeks 2 days and already showing! Have been since about 6 weeks.