Help please?

So basically I had unprotected sex on 25th December and I was due on 30th December, I still haven’t come on and have no signs whatsoever to indicate that I’m coming on. I did a pregnancy test Monday and it was extremely faint, I have done one this morning and it’s negative. I have been having cramping and like a stretching and also got really bad constipation and like gas. My question is I know how late I am and usually it would show but because it was only 2 weeks ago today I had unprotected sex would it show or should I wait??? Thanks❤️