A 19-nor is in the same general family as the real AAS Deca or Tren. These will not aromatize, however they may cause prolactin related sides, ie. lactation or leaky nips. Bromocriptine or cabergoline are drugs that will counter the prolactin sides.
I like to be prepared for anything and everything that can happen, therefore if I ever decide to do a Spawn cycle, I will have one of those two in my arsenal.