Am I pregnant?

I had sex April 14th, while trying to put the condom in it got a small tear on the side, there was no precum in the condom and we stopped right away. I took plan B literally an hour later. I had my period the week I was supposed to, I tested once that week and once the week after and they were both negative. My left leg is twitchy and hurts sometimes, I really don't have any symptoms besides that. I took two test yesterday and both negative. I'm so worried, I am not ready for a baby right now. I can not get it through my head that I am not pregnant. I am so worried, I think about it so much. I go online and look things up and then come even more worried. What are my chances of being pregnant? Anyone else have leg twitches? It will have been a month since I last had sex tomorrow.