Hi, I am an 18-year-old female, and I ve always had pretty regular periods, but now I ve skipped for a consecutive 3 months, and I m wondering if this is serious enough that I should visit my primary care physician. I have gained 10 lbs over the past three months, and have been under significant stress considering this was my first semester at college, so I m wondering if the skipped periods could just be attributed to stress and weight gain. Thanks!