Hi,

Well done on breastfeeding so long and so well! No, the return of your period will have no impact on your milk supply. This is a myth. You will go on to breastfeed just fine. Yes, you should now regard yourself as fertile, so if another pregnancy would not be entirely welcome, use contraception. (This should be the case at 6mnths or before if you are not fully breastfeeding or if your period returns earlier.