Thank you for asking on HealthcareMagic.com, providing better healthcare for you. I have gone through your case and I can understand your concern. Ultrasound is safe during pregnancy, even when it is done very frequently. Women who have had a miscarriage have a higher risk to fail again than others. However it can be predicted clearly because there are many factors, and the most important is to know the cause of miscarriage in your previous pregnancy. Ultrasound is done frequently to be assured that everything is ok for you and for the baby. Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. I will be happy to answer your questions. Wishing you good luck! Please don t forget to give your valuable feedback and five star rating, to help me assist you in a better way. Click at I Find This Answer Helpful too . Please, write a review about your experience with me.