Do I need to report gift tax from a foreign person when I was F1 visa at that time

Hi,

 

I just read about tax gifts online and I am now freaking out.

 

In 2018, I received a sum of money for immigration application (>100k) from my parents from a foreign country

 

My parent are neither US citizen or a green card holder. I, at that time, hadn't passed the substantial presence test, and was under F1 visa. I believe I am classified as "NON-US person"

 

My questions: 

- Do I have to report this to the IRS via form 3520? Since I am Not a US person at that time, does this form apply to me? 

- I accidentally filled form 1040 instead of 1040 NR for 2018. Can I  and should I amend it now, if it does help remove my responsibility in filing 3520? I don't want to get fined