Hi, I think you need to do both trans-vaginal ultrasound
scan & serum BhCG ( blood pregnancy
test) to get your answers accurately. Although women with PCOS
have irregular periods
& prolonged cycles but your history is quite different and your previous two cycles were on time. I am concerned that you may have an abnormally situated pregnancy that is causing all that pain. So, please rule it out by doing the above mentioned tests. If any time your pain is sever or you feel weak you should rush to the hospital. If these tests are negative for pregnancy these may still give you a diagnostic clue. After that your gynecologist may guide you further. Best of luck.