It is generally considered safe for most pregnant women to engage in masturbation, including rubbing the vagina, during the 3rd month of pregnancy. However, it is important to consult with your healthcare provider regarding your specific situation, especially if you have large fibroids. Fibroids are non-cancerous growths that can develop in or around the uterus and may cause discomfort or complications during pregnancy. Your healthcare provider will be able to assess your individual condition and provide guidance on whether masturbating by rubbing the vagina poses any risks to your pregnancy or fibroids. They may recommend modifications or advise against certain activities based on your unique circumstances. Open communication with your healthcare provider is crucial throughout your pregnancy journey to ensure both you and your baby's well-being.