I am so scared!

I am freaking out right now. Me and hubby have safe sex and we're very careful, but my period is late and I'm so worried I'm pregnant again. And to be honest I don't want another baby. Me and my hubby got pregnant at a young age and have since had 2 more babies, and I'm so happy to be a mom of 3. I love my babies so much but to be truthful I feel done with the baby making stage of my life. I have to wait before I can test, but what do I do if it's positive???!! :(