Trigger warning .. 14 weeks pregnant

I know every pregnancy is different but I just can’t get something off my mind . I’m 14 weeks according to doctor . In the beginning I had very little symptoms. Like nauseous for like a week . Tender nipples for a couple days . But other than that I have NOOOOO symptoms . To the point sometimes I don’t even believe I’m pregnant. So I was about 10 weeks went to my first appointment and she showed me the baby on a hand held ultrasound. Heart beating nice and fast . She told me to get a early ultrasound done to see how far along I actually am because my cycle isn’t 28days . It’s usually 35-40. So at my 10 week mark I was most likely 9 weeks . I seen a tik tok where the lady had a 10 week ultrasound and the baby didn’t have a heart beat . And I can’t shake the feeling that this baby doesn’t have a heart beat . And the reason I feel thy way is because this is my 3rd pregnancy. They say the more pregnancy you have the earlier you show . Well im not showing at all and I’m not hard at all . I showed at 4 month ( I was so big) with my first pregnancy . And of course with my second pregnancy I was showing at 4 months too . So like why am I not showing at my THIRD pregnancy.. I want to add I never got the early ultrasound done . She said as long as it’s before my next appointment. My next appointment is the 27th . I called to schedule the appointment and they said because I’m not in first trimester anymore I have to call my doctor and have them send over another script/referral. So I’m doing that today