If you have missed your period and are experiencing pregnancy symptoms like dizziness, nausea after eating, mild stomach cramps, discomfort during sex causing stomach cramps, and foot pain, there is a possibility that you could be pregnant even if your pregnancy test came back negative. Home pregnancy tests can sometimes give false-negative results if taken too early or not done correctly. It is recommended to wait for a few more days and take another test or consult with a healthcare professional for a blood test which can provide more accurate results. Other factors such as stress or hormonal imbalances can also cause delayed periods and similar symptoms. If you are concerned about your symptoms or unsure about the accuracy of the tests, it's best to seek medical advice to determine the cause of your symptoms and get appropriate guidance.