i am a 19 year old female i feel sharp pains in my abdomen just below my belly button.?

[Danielle W]

i am a 19 year old female i feel sharp pains in my abdomen just below my belly button. It alternates between my right side, on the edge of my pelvic bone and the middle, about 2-3 inches down from my belly button. The pain seems to worsten at night but has gone on throughout the day. Mostly when I go to sit up or even pressure makes it worse. My period IS due in 4 days but my cramps have alwasy been mild, and how intense the pain gets, to me I know my body, it doesen't feel like any cramp I've ever had. I've been avoiding going to the hospital or a doctor because, well, I'm stubborn as hell, blantly put. My fiance belives its either an ovian cyst or a kidney stone, neither of which I'm knowledgeable about. Id really appriciate some help.