I've had it done. They give you a shaft and tell you to insert it for them and then they just move it around to see baby. Its not entirely uncomfortable at times. Its not pleasent but if it hurts you just need to tell them that its painful or to much presure. I've noticed it really depends on the tech tho. Some are better then other.
Yes they did that to me when i was 12 weeks it was very uncomfertable good luck
Haha my partner got upset when he saw that rod. He started sulking lol
A long skinny cold rod shoved up your vajayjay. Not pleasant.