If you are experiencing these symptoms, and are concerned that there is something wrong with your pregnancy, take comfort in the fact that millions of women who went before you experienced the exact same symptoms that are now bugging you, and that there are sisters who are going through the same thing right this minute. All these "menstrual cramps" and abdominal pain during pregnancy are telling you is that your uterus is working hard, and essentially, that your pregnancy is going well. While these stomach cramps are likely to be slightly uncomfortable, much like the type of abdominal cramping you usually have before your period, they should not be accompanied by bleeding, extreme dizziness, fever, or real pain.
In the case that you do have any of these, it is time to get in touch with your healthcare provider as soon as you can. These symptoms can point to the onset of an early miscarriage, or even an ectopic pregnancy, and might need treatment right away. Knowing whether your symptoms are normal and healthy, or whether something is wrong, can be nerve-wrecking, and even more so for women who are pregnant for the first time. If you are worried, and need reassurance from your doctor or midwife, do not hesitate to call them. Even though they probably get 20 similar calls a day, that is what they are for to guide you through your pregnancy.