Scared I’m pregnant

So I’m 17, and I’m on the Depo shot and I have been for over a year. Tomorrow I get my next shot. about 3 weeks ago me and my boyfriend had sex and as soon as we got done I started spotting. The spotting lasted 13 days! That’s never happened to me before. I never have a period anymore and never spot so I was very alarmed by what happened. I’m so scared tomorrow my pregnant test will come back positive. I can’t gave a baby 😩 I’m so nervous