5 days late and worried

Emerald

I’ve been 5 days late as of today and I am freaking out! I recently traveled from the U.S. to Japan on early march and havent had sex then! Got my period at the expected date and it was pretty normal. Wasnt light but wasnt heavy as per usual. Could it be just the air travel? And the stress as well?

AF WHERE ARE YOU AT!

Any advice would be greatly appreciated!