My girlfriend is on the depo provera shot, she's been on it for almost for to three years, and she noticed about four months ago when she was due for her vaccination that her lymph node started to swell under her right armpit, and she said last week that it happened again when doing a drill in p.e. She means the world to me and I just want some closure on the situation. She always tells me that she's stressed out because she balances school and work all at once. Could the reason for her lymph node in her armpit is swollen due to the shot and stress?