[Maria]

As I recall steroidal medication as well as certain other meds can affect the onset of menses such as with delay or even a missed period or just spotting so I don't think this is at all unusual. Sure you could be perimenopausal though even that is about a 12 year period. Most women follow their mothers more or less in terms of when they will experience onset of true menopause that is unless they have it surgically induced. Most likely you'll regulate again if you don't have any injections for a while. Editing to add that of course as you know stress (physiologic or emotional) can also cause change in menses though yours sounds related to your recent injections.