Lots of people get pregnant while they are still breastfeeding. I did although dd was 13 months old and only having 2 or 3 feeds a day. If you are menstruating I don't think there is any reason why you can't get pregnant.
I started having my period once DS went onto solids (ie 6 months) but I only fell pregnant 3 months after I stopped bfing. This was after a year of trying. I've no idea if this was a coincidence or not - the research I did suggested that if you were having your period you were likely to be ovulating but bf does affect your hormones and the doctors weren't interested in my lack of TTC progress until I had stopped bf. Good luck!