First Round of Clomid Cramping & Back Pain?

Lindsay
Hi friends!  This is my first round of Clomid. I started having pelvic/ovulation pain on CD 15.  OPKs positive on days 17/18/19. Pelvic pain is better but yesterday and today I've had pretty intense low back pain. Could this also be ovulation pain?  Anyone else experience this?  Thanks!