Are transvaginal ultrasound safe?

Molly
We tried for over 3 years, we finally conceived with iui number 3. We already had 2 beta hcg everything is looking perfect but they want to have an ultrasound this week (I'm only almost 5 weeks) because is to small still the only ultrasound is transvaginal, but I'm so scared that something may happen, online I read so many people end in miscarriage please help me anyone