I got the depo shot on Sept 15 2012. In Oct. I got a period and also in Nov. I decided i didn't 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's. I just want my period to return and i have been to two dr's that say it is a side effect of the shot but why after 3 months no period.