Late period

Kelsey

So I'm normally due for my period on the 20th of the month (Not a day later).. Friday I had wisdom teeth surgery which I was COMPLETELY nervous about & here we are 5 days after my normal period date & it's no where in site.. Breasts are a little sore.. I took a test this morning, was negative.. could I be pregnant nd it not be showing yet or could the nerves have pushed it back?