Ovarian cramps

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So last month I thought I was pregnant because I become very nauseous and horrible cramps all month long, when I started my period everything went away. It is now a week after my period and I’m feeling the same way again... I’m so confused and scared that I may have ovarian cancer or not be fertile.. someone please help me. I am 19 years old and not planning for a kid but thought I really was from how sick I was. My stomach feels a little sensitive when I touch it and I’ve been light headed all day.