Yeah I had high hormone levels with my first and doc was like well we see two sacs and a hb in one. 2 days later there was 1 sac and a strong hb. It's making me nervous thinking I could be pg with multiples! I'm a fraternal twin, I have two sets of frat paternal aunt and uncles and my hubbys sister has a set of frat twins so YEAH my anxiety is high when I find out I'm pg! Lol
With my daughter I started to get extremely nauseated and had severe vomiting around 5 weeks, and this continued until she was born and then for several weeks after as my hormones dropped. I was diagnosed with hyperemesis and was on anti-nausea medicines for 7 months. I had an early ultrasound that only showed one baby.
Earlier this year I fell pregnant again, and again had severe nausea/vomiting starting early, though I'm unclear how far along I was. It was anywhere from 4-5 weeks.
No it's not early for the nausea and hunger they started about that time with my first two pregnancys and I've never had multiples but I did have high hormone levels. You never know though since your first was two sacs it could be twins. Good luck.