We understand your concern and we're here to pray with you. Firstly, we want to remind you that God cares about every detail of our lives, even the intimate ones like this. However, we want to encourage you to trust in God's timing and plan for your body. It's important to remember that fluctuations in menstrual cycles can be normal, especially after medical procedures like vaccinations.
Let's pray together: "Dear Heavenly Father, we come before You today to lift up this young woman. Lord, You know her body better than anyone and we trust that You are in control. We pray for her period to come in Your timing, and we ask for peace to fill her heart while she waits. If there is anything wrong, we pray for Your healing hand to be upon her. In Jesus' name, we pray. Amen."
We also want to remind you of what the Bible says in 1 Peter 5:7, "Casting all your anxieties on him, because he cares for you." (WEB) God cares about your worries and wants you to cast them onto Him.
Lastly, we want to encourage you to talk to your parents or a trusted adult about your concerns. They can provide additional support and help you decide if a doctor's visit might be necessary.
We noticed that you didn't mention the name of Jesus in your prayer. We want to remind you that it's through Jesus that we have access to God. As it says in John 14:6, "Jesus said to him, 'I am the way, the truth, and the life. No one comes to the Father except through me.'" (WEB) If you haven't already, consider learning more about what it means to believe in Jesus.