I was only on the pill for about 2 weeks and I had sex for the first time. He pulled out before he came and was wearing a condom. I had just went off my period that day. I went home for break and only bled about 2-3 days. And it was almost a brown color. I haven't had my period since and my breasts have doubled in size, I'm tired all the time, and have gained weight. Are these normal symptoms of going on the pill for the first time? I'm freaking out that I could be pregnant. It was only one time.