it just depends, everyone is different and their bodies respond differently, or at least our level of perception to what our bodies are doing may be different. If you are pretty in tune to your body, you may notice symptoms like sore bbs, frequent urination, excess saliva, cramping in lower abdomin, or back pains. Nausea and constipation/diahrea are not uncommon as well.
hope this helps!
Lynn
Teresa