I got a cortisone shot in the 18th of this month and my period is now 4 days late, did the shot throw my period off?

Unlikely: but certainly "possible"...if your period does not come in next week...get a Pregnancy Test Hope this helps! Good Luck Dr Z

Cortisone: Cortisone is a mineralocorticoid and serves as a steroidal anti-inflammatory drug. Check out http://www.drugs.com/sfx/cortisone-side-effects.html for side effects associated w/Cortisone which states "menstrual irregularities in women have been reported rarely". To be sure, if you engage in unprotected sex, take home pregnancy test as late period isn't common side effect. Irregular menses are commo