Many women will notice that they feel uterine cramping in early pregnancy. This can be rather worrisome for some. You may notice that you feel period like cramps or even pain on one side. Some women even describe the pain as feeling very much intermittent, or spastic.
The most common reason to have pain that feels like cramping is actually your uterus growing. This is normal pain and should be expected in a healthy pregnancy. You may also feel "full" or "heavy" in the area of your uterus. It's not uncommon to hear that in early pregnancy women describe feeling like they were about to start their period "any minute."
You should call your doctor or midwife immediately if you experience any of the following with your cramping:
- spotting or bleeding (potentially implantation bleeding)
- one sided pain (could be an ectopic pregnancy or cyst)
- increasing or severe pain
- concern that isn't abating
You can also watch this video about cramping in early pregnancy for more information.
The real concern with the pain is that there is something wrong with your pregnancy. Obviously with every ache and pain, the fear of miscarriage can increase. The good news is that many women experience some types of pain in pregnancy that are not related to any form of pregnancy loss.
Source: Obstetrics: Normal and Problem Pregnancies. Gabbe, S, Niebyl, J, Simpson, JL. Fifth Edition.