Unfortunately, there's no way to predict how your period will react to taking T.
Mine went the opposite direction of "short and quick" and "never having another one after the first injection".
Mine went for nearly 3 months almost non-stop - I would bleed profusely, the heaviest I had ever experienced, and painfully for 2 full weeks - stop for about 5 days, then start another 2 weeks of bleeding and cramping. It was horrific, but luckily, when it stopped - it didn't come back, and hasn't since (hoping that it stays that way after 2 years now).