At three weeks you may be getting a little boost still. Also depend how big that last shot was.
You will have extra red blood cells for (months I think).
I generally crash on day 21 on SUS and about 14 on Deca. Both have the long acting Decanoate ester, but I usually use bigger dose of the SUS.
Take awhile off and see if you don't crash bad. If you hold some decent gains off such a conservative cycle is great. It may not be repeatable. Shorter low dose cycles are not popular here, but if it works...
Short cycle logic plays off fact that Nat test usually start to drop around week 3 or so.
You could experiment w/ the less suppressive stuff like Stanoz, Primo, Test Prop + Deca again.
These are all EOD shots. 50-100mg is conservative. And,Even 1 or 2 tabs of Dbol preworkout rocks. Even 5-10mgs Dbol a day added to your Deca is significant, but even that little Dbol is very suppressive of Nat Testo. May require Nolva or A'dex...
HCG is a usefull thing. Its hotly debated here. Too much can be suppressive, big jolt of Test=Conversion to estrogen. A little (200-500iu 1or2X wk) is thought to prevent suppression of nat by many. I'm personally
not so sold on that, but I run HRT nonstop. Bottom line is SLOWLY find what works well 4 you, with minimal
unwanted sides. Better bone up on ANti-estrogens before you play w/ Testo, D'bol, HCG... Gyno risk.
Have Fun
.