Yeah, it was weird to me too but my doctor said with twins one is always a few days bigger than the other. It's not a problem until it's like a week or more difference. So I guess it's okay as long as they're not like a week behind.

That's so weird. I never got told differently when I was pregnant with my daughter. I'm not too worried about it, I just find it weird. @dang_dridri

No really. You could've just ovulated a few days later or something. It's still close so if the doctor isn't worried I wouldn't be. I'm having twins and at my last ultrasound one was 8 weeks & 6 days and the other was 8 weeks & 4 days but the doctor wasn't worried.