"Probable involuting left corpus luteum cyst"

Anne
So the doctors released the information from my first ultrasound. I was reading through it all calm and happy (yay, live baby, yay, 7 weeks, yay heartbeat of 152) and then I noticed this thing that said "probable involuting left corpus luteum cyst". What is that?? Should I be concerned. I can't really find much online.. this is my Rainbow baby (after 3 losses) and I was feeling fine until I seen this..