Coffee Addict vs Pregnant

Ok I have a very serious question. At the moment I may or may not be pregnant. I've gone to the Dr. and got a blood test done and so far my hormone levels are at a 5.64. She said if I'm pregnant then I'm BARELY pregnant. I'm 3 days late (which isn't bad yet I know) so just for added assurance I took a p test and they were both negative. However I'm already having symptoms of pregnancy: super tired even after 8 hours of sleep, constant headaches, nausea, sore nipples, cravings from chocolate to a sloppy joe (which i normally hate), and constipation. So this is my question: I'm in college and need to get a ton of work done this week but all I want to do is sleep! Would it be safe to have 2 maybe 3 cups of coffee right now, pregnant or not? I've GOT to get this work done but I don't want to risk harming any buns in my oven.