Please help with flying...

I have a 3.5 year old and a 1.5 year old and currently pregnant 15weeks.. I will be going across country back home alone with 2 kids. And I'm freaking out... I dont know how I will manage I have no other choice :( ... will the airport help me... will the people on the flight be mad at my kids for distracting them ughh..never done this before

I do know to put things in the carry on for them to snack on toys to keep them busy ... just scared to go alone there is no way someone can come with me... my husband is not with me..

Can anyone share there experience please.