Constant cramping at 12 1/2 weeks ?

Anyone else have/ having constant cramping ? Since weds. Night I've had basically constant cramping and lower back pain. So going on 48 hours. I did have some bloating and gas build up. But I went #2 a couple hours ago. 
Is it normal ? No spotting or bleeding. Just really annoying. I feel
Full down there and achy / cramping almost like pms.