Am I just being paranoid like always..?

So I'm scared to be pregnant but lately I've been SO tired! And that's a pregnancy symptom Maybe it's because I recently got this job and I'm working nearly everyday but I got a period may 26 and it lasted 4-5 days, it was medium and the blood was bright red, I probably sound so stupid but I hear all these stories on how they got pregnant and didn't know until a long time.