Could I be Pregnant?

Cayla
Okay so here goes. 
My last period was on April 24. I typically have a cycle of 32 days. My next period is supposed to come May 25.
Over the past week, I've noticed a lot of odd things happening with my body. 
1. Terrible headaches (2-3 a day) 
2. Odd cramping
3. Lack of acne (I usually get some 1 week before my period starts) 
4. Extreme tiredness (I've spent the whole weekend in bed) 
5. Hungry a lot although not craving anything specific. 
My boyfriend and I had sex around the time I was ovulating (and other times too). We would start without a condom but would stop and put one on before things got too far. 
Just curious, could I be pregnant or am I worried for nothing?