I feel like I'm on my period..

I'll be 30 weeks tomorrow but today I feel like I'm on my period. I get nervous everytime I go to the bathroom and wipe cause I'm scared I will see blood. I have had a previous miscarriage but I have never made it this far into a pregnancy. I know my baby girl is fine because after I ate breakfast she's was moving and wiggling like she always does. But is it normal to have period like cramps and a lot of discharge 30 weeks pregnant?