you most likely have delayed muscle onset soreness or D.O.M.S which
occurs hours after the exercise is over.this is much different than the acute pain of a pulled or strained muscle.a muscle tear,is felt as an abrupt,sudden, acute pain that occurs during activity,that is often accompanied by swelling or bruises.
D.O.M.S is normal bro,especially with hardcore training it's a result of microscopic tearing of the muscle fibers.The amount of tearing (and soreness) depends on how hard and how long you exercise and what type of exercise you do.activities that require muscles to forcefully contract while they are lengthening,(eccentric contractions),seem to cause the most soreness.you use eccentric contractions when you descend stairs,run downhill,lower a weight,or perform the downward motion of squats and push-ups.in addition to muscle tearing,swelling can occur in and around a muscle,which can also cause soreness hours later.