Welcome aboard. Motrin. 800mg will take out that soreness. TestP is a big pip inducer. Warm the area. (Heating pad) should clear up 7 days or so. That’s my avg for pip pain.
Also if self injection, what length and gauge of needle? Are you steady when injecting? Needle shake or not staying consistent in depth are all enablers of PIP.
Shoulder pin spot if too low can be a problem. If first time in delt, could be a virgin muscle thing too.
Lastly. Some of the products are loaded “hot” so you could be getting a bit more than you think.