What Causes Delayed Periods Along With Pain And Itching On Lower Abdomen?

I have missed my period. Had troubles going to the bathroom. Couldn't urinate or do the other. Sharp pain sometimes occures on right side. I have symptoms of being pregnant but the tests say negative. I'm now experiencing an uncomfortable itchy/pain on right side and feels like it's near ovaries. Got a pelvic exam and I was told there's something on right side. Could I be pregnant? Or is this something else?