Having horrible anxiety

I'm 23 weeks pregnant and I'm a teen mom I'll turn 18 a few weeks before my baby arrives and I am terrified I was not scared at all in the beginning but now everything is hitting me and I'm soo paranoid about something going wrong or that I won't be a good mom I've literally been thinking about it non stop for the past 2 days does this happen to everyone ? I worry about my baby constantly even though my dr says everything is going normal.