TM - your EDD won't make any difference - there will be no changes to baby bonus until at least July 1 (and if you're that overdue, i think we'd be looking in the loony bin for ya!)

given you're in a defacto relationship, they'll search for a record for each of you and work with that - it's fairly straight forward. it IS easier to do it on the phone (as someone there knows how to interpret the questions for you!), but you can do it online for sure - just make sure you provide everything you're asked at the end so as not to delay your application