Ok, well even being transdermal, that is a low dose. I think you could do another 4 weeks and be fine, even without a PCT. Or you could take some of the better natural test boosters after the Androsterone, like Competitive Edge Labs M-Test. Now, these are just my estimations and no one can guarantee you anything. And a real PCT of Nolva or Clomid is almost never bad idea. I would personally be ok running that low of a dose of that mild of a compound without a PCT, but that's just me. If I'd be unsure about it, I would check via blood test or run a serm, just in case. Tamoxifen 20 mg for 2 weeks would probably be enough. Or Clomid 25 mg for 2 weeks. It's a bit tough to estimate a suffficient PCT protocol, when it's uncertain, if a PCT is needed in the first place.