Are twins a possibility?

I am pregnant with No. 4 and I started showing very early 8 weeks! I didn't show with my others until around 4 months. I know I am expecting 1 but I still can't believe how big I am. You are experiencing lots of nausea which can be a sign of twins, I am a little worse than I was with my others but not as bad as you. I think Identical twins can occur without it being in the family where as non identical can run in families. Also it depends how old you are - over 36 and you are more likely to have twins. When do you have your ultrasound? you should find out then.