i think i am 'spotting'..i been on t for over 3 weeks now. when does this end or stop coming? or whats your experience with this..thanks.

It's different from person to person. Mine didn't stop until 2 or 3 months, I don't remember, but I do remember thinking that something was wrong and it would never end. However, as I said, I learned that it varies from person to person.

I started my last period a few days after my first shot. 

Took me 4 months (I think?). Most guys seem to have it end after a month or two.

As everyone else said - it varies unfortunately.
After my first shot I started but it was shorter than normal& hasn't come back.

Like Nygeel, mine stopped only just now and that's at 4 months.

Mine didn't stop until after 8 months and that was because I upped the dose without my docs permission...if I would've went with what he wanted I'd still be raggin and I'm almost 2 years on T.

I had my last one a week after I started Testosterone.

mine been between 8 months too 1 year..
its hard to say all exactly since it was alittle  irregular at the end + I also had to stop for top surgery and had changed T a couple of times.