Trying to conceive and breast feeding

Lyn
I have a one year old who still has one bf before bed. It's only a few minutes but I'm fearful that this could hinder my chances of conceiving? My period was late last month and it never is and I wondered whether my body had tried to get pregnant but the bf had stopped it? Can anyone shed any light on this Thankyou. Would it be better to stop breast feeding altogether?