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First let me say that competency in performing ultrasounds depends on experience and time. While most midwives can do basic ultrasounds (US), I can't say if any of the midwives who performed your US were or were not competent. At this point you should request an US by a US technician (a person trained to do ultrasound as their job description) or in a radiology department. Midwives just like physicians (non-radiologists) may get extensive training or just a little, they may have a lot or a little experience. But getting an ultrasound by a US tech or a Radiologist (a physician trained specifically in all of the radiology techniques, including US), will definitely have the experience warranted in your case.
The insertion of the probe into the vagina may not have been far enough to get an accurate picture of the embryo. This is why I suggest you request a formal US in a Radiology department or center that just does US.
I do hope the remainder of your pregnancy proceeds much better. Try and keep a positive outlook, as a mother's mental state can impact the baby. And of course make sure you are taking your prenatal vitamins and drinking plenty of water.
Let me know if you have any further questions regarding this question as my goal is to make sure you are completely satisfied with your answer.