I am experiencing light cramping that I usually feel when my period is about to flow, however, there is no blood showing itself.

I am supposed to start my period today.

There is a chance that I am pregnant, however, I took a test yesterday and it was negative.

Should I take another one? Is this normal?

A little bit of history:

A month or two ago; I took two Plan B’s in one month and since then, my period’s been a little whacky. I’d have a period once every second week and that hasn’t happened this time, so maybe my body is finally balancing itself out.

I have been really emotional and moody this week, as well as nauseated throughout my days (could also be from tobacco).