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The night before I noticed my arm had mild pain in it almost like I pulled a muscle it had not been hurting all that day I know that unexplained left arm pain is a sign of a heart attack knowing this information I began to monitor and worry about myself a

Question unfinished. If it feels like a pulled muscle, it is most likely a pulled muscle, especially in a 26 y/o, unless you have a strong family history of early heart disease. Take some Motrin and if the pain doesn't go away in a couple of days, or gets worse, see a doctor.
Very unlikely. Yes - left arm pain could happens with heart attack but is shorted in duration, is accompanied by pressure in the chest, difficulty breathing, cold sweats, in older individuals with predisposing conditions. In your situation - I agree that most likely you pulled a muscle.