Could I be pregnant?

Chelsae • I believe God sent His son Jesus to die for our sins. I`m so thankful that He did. I am married & in college for health.
Alright, ladies. I need advice. I am four days late. We are TTC and had sex the days I ovulated. The other "symptoms" in having now would be cramping VERY lightly & my joints hurt BUT I honestly think I could just be getting sick. Yes, I tested. Today, two days ago, and two days before that. All negative. So why am I late? Ive started on time for months and months. Can it be negative after that many days late and I still be pregnant?