I’ve been having some right sided pains for awhile now and was sent for a pelvic ultrasound which revealed a corpus luteum in my right ovary, what does that mean? Especially since I was on nexplanon for the past 5 months and I thought ovulation doesn’t happen?? Can anyone help me understand what is going on?? Thanks!

Edit: not sure if it matters but I did have a couple positive pregnancy tests before the ultrasound but I guess they were false positives? ((different brands with positive results)) but who knows anymore; confusion :/