fsa,
my LMP was on 17 Jun and O date was on 4 Jul, exactly 3 days diff from u. visited my gynae 2 days ago and scan says bb is 6.5wks.. which is correct based on O date. So if ur O date was on 1 Jul, then ur bb is abt 7 wks, so only slightly smaller. Actually i think it is cos u have accidentally counted an extra wk to ur preg. If go by LMP, the first week is considered wk0. If go by O date, the O date is wk2.
Did gynae mention anythign abt bb being small? The ultrasound scan should indicate the size of the bb, mine indicated average. Shouldnt be a concern if gynae din say anything. Different bb got different growth spurts.