Please helpppp

So i’m now 8 days late of my period.

Me and boo did have sex but we used condoms for protection.

When i realise i was late for my period i took a test every morning right after i woke up until now but the results were all negative.

During my cycle i do travel from UK to Vietnam then back to UK and I was under stress

Can u guys please help me out what’s wrong!!??

Below here is my last cycle and my sex life, just for u guys to have sth to base on to give me some advice ❤️