Unsure mom

So we had our ultrasound done for the 3rd time last week. The baby didn't cooperate and she could barely get measurements well she guessed on the gender but I can't help but my gut telling me she is wrong... I feel so guilty. She left a bruise trying to get  the baby to move and was really rushed each time. What do you think? I honestly don't know. This is my 3rd baby, I've never had this trouble before. I am changing OBGYN offices due to other issues, should I ask for blood test? Or another US?