I am currently 17 weeks pregnant. I have had to have many ultrasounds in this pregnancy due to early stong cramping. All together in my first trimester, I had 6 ultrasounds and 5 of them were vaginal ultrasounds.Also, with two of them, I had to have ultrasounds on back to back days because of the cramping. I am very worried that I am have harmed my baby and his developing brain. Because I had many early ultrasounds, could I have harmed my baby or caused any brain damage? Also, I have been using a fetal doppler about twice a week for a few minutes each time. Are these safe?