So confused!

This is our second month trying to conceive. I've only tracked those two cycles and my period was due yesterday. I keep getting cramping on and off but no sign of blood. I feel like it's going to come but it hasn't. I took a test today and it was negative. I also took one three and four days ago and those were negative. Could I still be pregnant and it be too early for testing, or does it seem like my period is just going to be late?