Is it possible that I'm pregnant?

You could be pregnant. Headaches can be a sign of pregnancy. You may be bloated, another sign of pregnancy, that would explain the weight gain in your stomach. Early pregnancy symptoms are like really bad PMS symptoms, worse than usual. I had sore breasts, mood swings, and could smell everything a mile away. I also had cramps that felt like mild menstrual cramps. Nausea usually kicks in around 6 weeks, give or take. Every woman experiences different symptoms. Some are lucky and don't have symptoms. The only way to know is to get a pregnancy test. You can get pregnancy tests at Walgreens or walmart and pay for it at the pharmacy. You can even lie and say it's a gag gift for a friends birthday present. Do what you have to do but, you need a test. If you are mature enough to have sex then you should be mature enough to be safe and responsible. If you are pregnant, see a doctor as soon as possible so, that you can have the best start for you and your baby. Good luck to you!