Why I dont have a period?

Patient: Hello my name is Gladis and I am having a few concerns. I am periodically having no menstruation and its beginning to be concerned because now I am feeling more bloated than anything. I have been with my current boyfriend for 4 years and we have been having unprotected sex and im concerned since I have been checking if I can get pregnant but it comes out negative. I am concerned I may not be able to have babies. I have talked to my PCP who advised me to try birth control. I get very sick with birth control and do not wish to take it. I would really want expert opinion as far as what I can do far treatment and my issue.

Symptoms: No menstruation