First pregnancy advice, i’m scared :(

I found out today that I’m pregnant. according to the first day of my last period, i’m a little over 5 weeks along. I have felt every emotion possible since I have found out. I’m excited, but all in all i’m so scared and almost dreadful. I’m 23, not too young at all but I hate change and this is about to change my entire life. I want kids, and haven’t been doing anything to prevent it. Now that it’s here, I feel awful feeling so pessimistic. I was a heavy vaper and 🍃 smoker until 12 hours ago so I’m sure i’m feeling those cold turkey withdrawal feelings too. Any advice, peace of mind, or literally anything would help me right now.