Hello Alesia Marie,
Thanks for posting on HCM,
Rupture or torsion of ovarian cyst
can lead to severe pelvic pain
which will require emergency laparotomy
to excised the cyst (even though yours is quite small). Well if pregnancy is still very early, then ultrasound would not be able to quite show clearly that you are having an evolving pregnancy, reason why, only a cyst-like structure could be seen. It will be better to wait for a couple of weeks (like a week or 2) to do a pregnancy test and redo a pelvic ultrasound.
Other possible causes of pelvic pain order than ruptured cyst are PID, threatened miscarriage
etc. Your gynobs could rule those out and provide you with appropriate treatment.
Hope this helps