There are so many different things that can cause a pain in that region - let your doctor know. It could be as simple as ligament pain from your growing uterus, to a kidney infection, to an ovarian cyst. If it's radiating to your back like that I would request a urine analysis just to rule out any kind of kidney infection.
*Spontaneous* OHSS diagnosed 08.06.2012 Right ovary removed 09.04.2012 via vertical laparotomy Essure implant placed on remaining tube 06.13.2013; successful followup scan 09.30.2013
Re: Cramping by left ovary
Right ovary removed 09.04.2012 via vertical laparotomy
Essure implant placed on remaining tube 06.13.2013; successful followup scan 09.30.2013