I'm 28 weeks with twins. My actual due date is April 1, but w/twins it's more like March 9. I'm also on strict bedrest due to threatened preterm labor, so who knows when they'll make their debut ;) I had my u/s on Friday to chart their growth & my boy is measuring 2 lbs, 5 oz & my girl is measuring 2 lbs, 3 oz. I'd say as long as your doc thinks your little one is growing appropriately for his age, you'll be just fine. I noticed you're two weeks ahead of me & my doc said I'll notice a lot of growth in the 3rd trimester :) Best wishes!!!
I wouldn't get too concerned. Those measurements can easily be inaccurate. My friend was induced early with what was supposed to be an 11lb. baby, but she was only 8lb.
I had a sono today as well. I am due March 17th so I also have 10wks left. I don't think our babies are that big of a difference, I am having a boy too. He is aprox. 3lbs 6oz. That's only 3oz different. My doc hasn't said he is big but she said he is plump and healthy. She said all is fine. I don't think they would let it get to the point to where he got stuck either. If they see he won't fit, they will do what they need to to get him out. I hope you feel a little better. :) Good luck