Since I gave birth to my son about 2years ago I have not been menstrate. ## That can happen, if your natural hormone balance is thrown off, which frequently occurs after child birth. Have you consulted your doctor? As explained by the NIH, sometimes hormonal supplementation can correct the issue, you may need to take one hormone, or several to help correct the problem. The FDA lists the typical side effects as possibly including nausea, dizziness, headache, irritability and breakthrough bleeding. Is there anything else I can help with?