Bad cramping

We’ve been trying to conceive for a couple of months now, and I’m hoping this month is the one. My period usually starts 26 to 29 days after the beginning of my last period, and today is day 27 and no bleeding yet. Though A few days ago I had some slight cramping, and today bad cramping like I was on my period but am not. I took a pregnancy test and got a negative result. I’ve never had cramping outside my period, could I be pregnant and testing too early? I’m going a little crazy here!