How do I move past the feeling of fear?

So, 3 days before AF is due and I just found out I'm pregnant! I had a TFMR in May when I was 4 months due to contracting Rubella and had a chemical pregnancy in August. So this is the third time I am finding out I am pregnant this year. I am feeling so positive about this pregnancy but also so worried. The first thing is for my AF due date to pass then I know this is not chemical. Maybe after then I will feel better but what helps you move past the fear?