First official appointment!

I will be 12w+3d with my rainbow baby at my next appointment on the 30th! I'm so ridiculously excited! I have questions! This is my first pregnancy that I've made it this far....1) will I hear the heartbeat 2) Do they probe you? I HATE the transvaginal ultrasound!😂 3) Will they be able to tell me more about my due date or will it change from my last appointment where they predicted it based on my last menstrual cycle? I'm doing the blood test for an early gender reveal-->4) Has anyone done this and it ended up being inaccurate? TIA💖💖💖