Yes, it is generally safe for pregnant women to have sex during the fourth month of pregnancy. However, it is important to consult with a healthcare provider before engaging in any sexual activity. In most cases, as long as there are no complications or medical conditions that would make intercourse risky, it is considered safe. It's important to listen to your body and communicate with your partner about any discomfort or concerns. Some precautions that can be taken include using positions that are comfortable and avoiding deep penetration. Additionally, using lubrication can help reduce any potential discomfort. If you experience any bleeding, pain, or other unusual symptoms after having sex, contact your healthcare provider immediately.