Hi, I'm 37yrs old an I'm having a bilateral ovarian cysts (endometrioma).my ob gave me a depo shot for 4 months. (february, march, April & may 2011) I have had a heavy period last July but after such I have no longer a period until this time only spotting but not heavy.. sometimes it stop but only a period of weeks (2-4 weeks) then back again... when will I have my regular menstruation be back?. my cysts is still here measuring 4-5cm both and I'm about to have it taken next month...