A missed period accompanied by pelvic pain can occur due to several common reasons, including hormonal imbalances, ovarian cysts, or stress. Although your home test was negative, a blood pregnancy test and a pelvic ultrasound by a doctor are the safest next steps to find the exact cause. Please avoid taking any strong prescription medications without a diagnosis. For temporary relief of mild discomfort, you can use over-the-counter pain relievers like ibuprofen. However, please consult a healthcare provider promptly for a proper evaluation, and seek emergency care if you experience sudden, severe pain, dizziness, fever, or heavy bleeding.