ive heard that its not very common to ovulate whilst you are still breastfeeding, thats why you dont really get periods until you stop. but you never know, you would be extremely lucky to get pregnant whilst breastfeeding so if you are i'd see it as a blessing and you were meant to have two children so close! i also have a 4 month old daughter and i really want another already lol, my OH does too but i want one now but then again i want to wait till DD is 1 to start TTC. i cant make my mind up what to do! but im currently on the pill and trying to force myself to keep taking it lol x