Breastfeeding and ttc

Me and my husband have a six month old little boy , we want three kids all close in age . We're ttc our second , but since I'm nursing , I haven't had a regular period . Last month I was hurting really bad in my ovary .. I thought it could possibly be a cyst .. Since I haven't been ovulating regularly . But on the 31st I woke up with spotting . It lasted about two days and now it's starting to deminish . My periods last anywhere between five and seven days . Could this be implantation bleeding ?? Or my period . I haven't tested yet . I don't want to get my hopes up .