I would try not to worry about a
miscarriage unless their are
symptoms leading up to a
miscarriage. It is normal to feel cramping throughout pregnancy, You may feel growing pains, round ligament, sciatica nerve pain and braxton hicks. Any cramping accompanied by fever, nausea, vomiting, gush or drip of fluid coming from the vagina or period like menstrual flow should be taken into consideration asap.
Try to relax as much as you can, get at least 30 minutes of exercise..