What could this be?

Amanda • Wife, Mother To An Angel Baby & Rainbow Baby Girls.
So my period is suppose to start tomorrow. Now since I was 9, I always spotted a few days before my period came(I'm 26 now). This month there is no spotting which is weird to me. This morning a had a slight lower ab cramp on my right side. I've been so tired lately, I was reading a book to my preschool class yesterday and I kept running out of breath and I'm going to the bathroom more than usual. To give you the heads up, my hubby & I had unprotected sex 1-2 days after my fertile days, and we use the pull out method like we always do.