2 weeks delayed

Rxxx

So I'm 17 days delayed. And thiz is the 1st time that it happened. A day prior to my expected period, my SO and I had unprotected sex. Usually, I get delayed for 5 days. After the unprotected sex, I have been feeling all the period symptoms but up until now, it hasn't arrived yet. I've taken a pregnancy test yesterday and it's negative but there's a faint 2nd line. I'm trying again tomorrow morning when I wake up. I'm getting so stressed out.😔