Plan B experiences??

So I had just gotten off my period the morning of me and my boyfriend fooling around. There was no penetration but pre-cum did get close and possibly inside of me. He freaked after he came and told me to take plan b. So I did.
Ruby says I should have gotten my period 5 days ago, but I haven't and I'm scared. I can't go to a doctor because I have no insurance, and I can't pay 350+ dollars to get the miscarriage pill, because I don't have any money. His parents are super religious and will make us break up if they find out I'm possibly pregnant.
Please, please, please tell me I'm over thinking this. Please share your Plan B experiences with me so I don't stress out as much as I am.