Lying about my period?

I really don’t know where to to begin, but basically I had casual sex with this guy (protected and nowhere close to my fertile window so the chance of pregnancy is so slim). ** this was the only time

He’s like super paranoid about pregnancy though, and asked me when my next period was expected so I told him when..

My period was due yesterday, but it’s late. Honestly this happens to me all the time, my cycles tend to be slightly off some months so I’m not freaking out. (I’m getting my usual symptoms so I know it’ll be here within a few days or maybe next week).

But this guy I slept with keeps asking me if I got it or not (like literally started last week even though I said the week of the 11th when he asked long before).

A part of me sort of just wants to fib and tell him I got it just so he’ll stop freaking out lol.

(I’m confident that my period will come, she’s just a little late lol)

But the mature part in me wants to continue being honest 🙄

What should I do?