Could I be pregnant?????

Saralena
So, I had sex on my 27th and 28 and 1st and 2nd. All is unprotected sex and he came inside of me those times. 
Lately I've been feeling real fatigue and dizzy and I have light cramps on and off. And none stop peeing 
My question is could I be pregnant and when can I take a test?? 
Please help