Confused, can someone help?

My husband and I have been TTC. I'm almost 22, I just had my first pissed period. I've been feeling really off, always sick to my stomach, bad headaches, back pain, extremely exhausted, but then I can't sleep. I took two tests: one in the middle of my missed period and one 2 days after my pissed period: both were BFN. Am I just testing too soon? Could I just not be pregnant? I'm pretty confused.