I am 15 weeks with DC2. I had a big bump with DS, but not this big, and not this early.
I am HUGE. I know everyone probably thinks that, but IMO I really do look about 6-7 months pregnant, with a big, sticky-out bump starting from under my boobs. 
It just occurred to me - could this be a sign of there being something wrong? Like too much fluid? I had a 12 week scan which was all normal (no twins!).
Anyone else felt they were just too big for their dates? Will see midwife soon and ask her but in the meantime would be great to hear if anyone else has felt like this/has any info...