hey, i started my first cycle last week monday, test p EOD 100mg/ml. the first injection in the right arm, then left thigh, then right glute. the first 2 were sore for about 2 days. the glute shot was painless for a day, then soreness started the next day. i took another right thigh shot today, completely painless. this might sound dumb but is there any reason some are painless and others arent?