Freaking out spot on baby’s heart

I just went to my 21 week appt thinking I was going to do a follow up on my anatomy scan. Only to find I needed to go back because they get everything they needed since baby girl was sleeping curled up. My doctor said that they saw a spot on my baby’s heart and that it can be normal if everything else is okay. What does that even mean?! Like I understand but “a spot on my baby’s heart” isn’t a very settling sentence. Anyways she listened to the heart and baby kicked her which was nice because she said that those kicks are really strong which makes me feel a bit better. I’m scared about my baby’s health. I’m just sitting at a tacobell because I don’t want to go home.