my sister got her first depo shot around 4 this afternoon. now (2 hours later) she says her arm hurts really bad, like a dull ache, especially in her shoulder area. it is hard for her to move her arm. is this normal? i wasn't in the room with her when she got the shot and she says the doctor didn't tell her that it would make her arm hurt. i haven't had any shots in recent memory so i have no idea if this is normal. she is prone to drama (she's only 16) but seems to be in actual pain.