level 2 ultrasound coming up

hello beautiful mamas! i have a question to ask you all if you know or have been through it. on the 21st of August I will be with in 20 weeks pregnant. they are going to do a level 2 ultrasound since I have a history of epilepsy . I took blood to see what I would be having and it said it was a girl. but I want to make sure on the ultrasound. does level 2 also tell you what you're having? and what are the steps you have to take before doing the test like day of ? do I need a full bladder? please help me ladies. I am nervous but cant wait as well