Most women experience pregnancy signs 8 to 10 days before a missed period. Some of those signs include light spotting, frequent urination, nausea, cramps, tender breasts, a rise in body temperature, constipation, and bloating in their abdomen area.
Every women is different and every pregnancy is different. With my first pregnancy I didn't know for the first few months but then I was on bed rest (sick as a dog) for the rest of the pregnancy. My second pregnancy I knew a little earlier but wasn't quite as sick. Most of my friends were the same. The only true way to know if you are pregnant is to take a pregnancy test. Most over the counter pregnancy tests are very accurate these days or you can go to your doctor and get a 100% accuracy test.