Twins?

I’m 5 weeks with my 5th pregnancy (3rd baby if it sticks) and I’m just curious as to what the signs were for anybody who was pregnant with twins? I keep having dreams I’m having twins, my symptoms are so strong already, my tests are all crazy dark. I have an appointment tomorrow to confirm pregnancy, but won’t get an ultrasound for another few weeks. It’s driving me crazy. Twins don’t run in my family, but there are one or two sets. So how did you know? Was it just a shock at the ultrasound? Did you suspect it beforehand? Give me all the deets!