Late period.

Here’s my calendar I’m 5 days late i had unprotected fun on the 5th/6th since then my stomach has been extremely sensitive, I’ve been nauseated and just ugh. My nipples were sore one day but not the next. I took a test tonight ( negative) Around 9pm today I chugged a liter of water (prior to test around 10:30) when I eat I feel nauseous afterwords and I had thick mucus discharge for a few days. I’m normally pretty regular I’m not feeling any stress or anything I Can thing that could delay my period. Let me know what you think pleaseeeeeee