Once you take your first injection of any form of AAS, your hormone levels will begin raising within the hour. Depending on the ester, it may take up to a few wks to reach supraphysiological levels, but the hormone will be active in your body from day one. No need for any form of PCT. If you have additional prop, it wouldn't hurt to take it for a week longer, after you begin your test e, to keep your levels from dipping too much, but outside of that, you will not need PCT