Need answers please!

Ashia • 20 years old February 19. Ttc baby #1 for 2 years. Currently in college studying Paralegal.
I'm TTC with my 1st. I start on the 10th every month. Regular cycle. I'm now 4 days late and 2 negative pregnancy tests. I feel a little bloated. And I'm cramping off and on. Certain ways I sit and lay will make me cramp some. What could this be? Should I keep testing or what????