Lower belly hard...??

Yes i have been having sex with no pull out , my next AF is due in 3 days. My boyfriend notice my stomach is hard where I cramp from the right side like in the middle of my lower stomach , my left side is normal the right is stiff kinda hard. I have been cramping when I wake up in the morning that can last for hours on the right side with pressure in abdomen area. Should I take a test?