I’m a first time mom. Help!!!!

I’m 21 years old and 35 weeks and 5 days pregnant. This baby was planned and the closer I get to my due date I’m overthinking a lot. I’m thinking about my son future, how I’m going to raise my son, school, everything hit me all at once. I’ve never felt this feeling of motherly love until I felt him kick and move in my belly it’s a very strong feeling. In my head I used to think that I couldn’t get pregnant, because I’ve never been pregnant before and it was hard seeing me being pregnant. It also took my fiancé and I almost a year for us to conceive. I thought it was because of his age or something was wrong with me (I was overthinking). Has anyone felt this way about their first child? Overthinking thinking a lot with your first?