 [ Symptoms ] no period after only having one depo shot i got the depo shot on sept 15 2012 in oct i got a period and also in nov i decided i did not want to get the shot which i had to go in on the 7th of dec to get it i did have intercourse on the 6th of dec and it was unprotected i was expecting a period on the 24th of dec and it did not come i am afraid i may be pregnant but i keep getting negative is i just want my period to return and i have been to two dr is that say it is a side effect of the shot but why after 3 months no period [ Disease ] yes first and foremost everyone 6 months of age and older should get a yearly flu vaccine however there are people that are more likely to get flu complications that result in being hospitalized and occasionally even result in death these high risk people include children younger than 5 years old but especially those younger than 2 adults 65 years and older pregnant women and people with chronic health conditions like asthma diabetes and heart disease