if it showed positive then your pregnant hun. I havent had my period either since i had my baby (May 2012) and i have been breastfeeding so thats the reason but i have no partner so im not pregnant. ( You ovulate before you can actually get a period).
I'm pretty sure that even if your breastfeeding you can still get pregnant.. whether you get your period or not. At least thats what the nurse in my baby class I took told us.
SR = DR my phone changed it! Lol
Breastfeeding is not a form of birth control. So yes it sounds very likely that you are pregnant. If I were you I would make an appt with the SR for an US and get it confirmed and your due date! keep us posted. Good luck.