if you used nolva for your serm it would probably be at least a week or two before you start to notice any rebound effects if you do experience any. reason being is that the half life of nolva is like 4 days or something like that so with 4 weeks of it built up in your system, its going to take a few weeks to clear, at which point rebound symptoms would become present if rebound was going to develop. just be observant of any odd sensations going on in your nips for a few weeks. when i had rebound, i was feeling very minor but odd sensations for a few days before i thought to check for lumps, at which point i realized i already had significant lump development... fml lol... so just pay attention. you should be fine though