Soreness depends on amount of BA, type of gear, how fast it was injected, etc. With cyp, human grade stuff should be pretty painless. With underground lab gear pain can last up to a week. I wouldn't worry unless pain lasted beyond that accompanied with redness or swelling around injection site (and area is hot to touch) and/or possible fever. Just soreness can be BA, injecting to fast or too much or just the type of gear, or unsteady hand causing muscle damage.