vaginal ultrasound

I am having my first OB appointment next week and at that point I will be around 7 weeks. My mother in law, who is a nurse, basically told me not to do a vaginal ultrasound, which is probably what they'll try to do since it will be hard to see anything with a belly ultrasound. What are your opinions? Have you had a vaginal ultrasound done early in your pregnancy? I am leaning toward not taking her advice cuz I just want to see or hear the baby if possible! If I don't do it I will have to wait even longer- probably 5 more weeks or so 😕