Liss,
I just wanted to add without being too technical..that if your cervix looks like it is funnelling you need to act on it. Do a little homework before your next appointment (just in case). A normal cervix usually measures 4-5cm but as the weight of your bub increases it puts more pressure on it and sometimes cant handle it. This is a common problem in multiple pregnancy as the cervix is under the pressure of more than one baby.
Once again it may just be genetic just lap it up for the next few weeks and use it as an excuse not to do much...hehe well it worked for me for 6 months
Bec