Random nipple itch that went away, should i be worried?

Been on 200mg pinning 100 twice a week for going on my second week as of today, before tha was at 120g twice a week and 100 before that once a week. Today during my workout my right nipple just randomly got itchy and then after 5-10 ish minutes went away and is fine, no lumps no other sensitivity. Should I worry?