Pcos?? Cyst in the uterus

Natalie
Today I went in for an ultrasound to see how big my follicles were. All my follicles were small and they said I had a cyst in my uterus. I don't really know what this means? And could this be the reason I haven't been getting pregnant for the last few years?? Also is a cyst in the uterus mean I have pcos or endometriosis? If you have any insite please help!!