LATE PERIOD ⁉️⁉️

Pls help me, I’m currently 4 days late on my period. I’m worried because I’m usually regular so I don’t why this is happening. I had sex two weeks ago, but was protected. I don’t know if it’s because I’m going through a lot of stress (recently went through a break up) and came back from a month long vacation in the west coast. Also, I’ve been sleeping very horribly like at 2-4 am every night due to the time zone change and I would wake up at 10. Let me know!